Expand dataset to 4,466 Fajr records across 98 locations (Batch 6)

Added 38 per-date individual DSLR observations from Kassim Bahali et al. (2019)
JATMA 7(2):37-48 across 10 new sites:
- Sabang, Aceh, Indonesia (5.876°N, 95.340°E) — 11 nights Dec 2017
- Yaring, Pattani, Thailand (6.934°N, 101.319°E) — 2 nights Jan 2018
- Surabaya, East Java, Indonesia — 3 nights Feb 2018
- Sumenep, Madura, Indonesia — 3 nights Feb 2018
- Ternate, North Maluku, Indonesia — 3 nights Mar 2018
- South Sulawesi (Gowa area), Indonesia — 6 nights Mar 2018
- Mersing, Johor, Malaysia — 3 nights Jun 2018
- Kuala Rompin, Pahang, Malaysia — 2 nights Jul 2018
- Nenasi Pekan, Pahang, Malaysia — 2 nights Aug 2018
- Kota Tinggi, Johor, Malaysia — 3 nights Sep 2018

Depression angles computed via PyEphem from actual dawn times + coordinates.
Mean D0 range: 17.07° (Pattani) to 19.61° (Kota Tinggi dry season).
Includes first Thailand data point (Pattani) and expanded Indonesian coverage.

+10 new unique locations (88 → 98)

data/processed/fajr_angles.csv

@@ -132,6 +132,12 @@ date,utc_dt,lat,lng,elevation_m,day_of_year,fajr_angle,source,notes
 2020-09-23,2020-09-22 21:14:00+00:00,-7.645,112.908,4.0,266,16.52718290450369,"LAPAN SQM 2022 (Damanhuri & Mukarram), Pasuruan East Java Indonesia",Pasuruan LAPAN; SH spring; time inferred
 2020-12-22,2020-12-21 20:59:00+00:00,-7.645,112.908,4.0,356,16.69329481266569,"LAPAN SQM 2022 (Damanhuri & Mukarram), Pasuruan East Java Indonesia",Pasuruan LAPAN; SH summer; time inferred
 2011-06-21,2011-06-20 21:33:00+00:00,-7.55,112.23,44.0,171,16.64428137518168,"Bandung/Jombang study 2012, AIP Conf. Proc. 1454",SQM observation; Jombang lowland site
+2018-02-24,2018-02-23 21:36:00+00:00,-7.255,112.803,5.0,54,14.896816749621646,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sumenep Madura Indonesia",DSLR; D0=14.90° computed; partial cloud possible; actual dawn time from paper Table 2
+2018-02-25,2018-02-24 21:31:00+00:00,-7.255,112.803,5.0,55,16.139979480455665,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sumenep Madura Indonesia",DSLR; D0=16.14° computed; clear sky; actual dawn time from paper Table 2
+2018-02-26,2018-02-25 21:22:00+00:00,-7.255,112.803,5.0,56,18.353765026314566,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sumenep Madura Indonesia",DSLR; D0=18.35° computed; clear sky; actual dawn time from paper Table 2
+2018-02-21,2018-02-20 21:20:00+00:00,-7.244,112.802,5.0,51,18.653822066742396,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Surabaya East Java Indonesia",DSLR; D0=18.65° computed; clear sky; actual dawn time from paper Table 2
+2018-02-22,2018-02-21 21:21:00+00:00,-7.244,112.802,5.0,52,18.45625542990519,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Surabaya East Java Indonesia",DSLR; D0=18.46° computed; clear sky; actual dawn time from paper Table 2
+2018-02-23,2018-02-22 21:21:00+00:00,-7.244,112.802,5.0,53,18.49648012147469,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Surabaya East Java Indonesia",DSLR; D0=18.50° computed; clear sky; actual dawn time from paper Table 2
 2020-03-21,2020-03-20 21:49:00+00:00,-7.212,107.904,717.0,80,16.55517984991157,"LAPAN SQM 2022 (Damanhuri & Mukarram), Garut West Java Indonesia",LAPAN best-sky station 20.6 mpsas; highland 717m; 7.2°S; time inferred
 2020-06-22,2020-06-21 21:50:00+00:00,-7.212,107.904,717.0,173,16.679702736217365,"LAPAN SQM 2022 (Damanhuri & Mukarram), Garut West Java Indonesia",Garut LAPAN; Southern Hemisphere winter solstice; time inferred
 2020-09-23,2020-09-22 21:34:00+00:00,-7.212,107.904,717.0,266,16.54698533045485,"LAPAN SQM 2022 (Damanhuri & Mukarram), Garut West Java Indonesia",Garut LAPAN; SH spring equinox; time inferred
@@ -164,6 +170,12 @@ date,utc_dt,lat,lng,elevation_m,day_of_year,fajr_angle,source,notes
 2015-06-01,2015-05-31 21:37:00+00:00,-6.4,106.83,65.0,151,19.376604637544194,"Saksono 2020, NRIAG J. 9(1):238-244, Depok Indonesia",SQM confirmed; near equator observation
 2015-06-21,2015-06-20 21:38:00+00:00,-6.4,106.83,65.0,171,20.013330239898416,"Saksono 2020, NRIAG J. 9(1):238-244, Depok Indonesia",SQM sky brightness confirmed Fajr; southern hemisphere
 2015-07-15,2015-07-14 21:40:00+00:00,-6.4,106.83,65.0,195,20.58680999808561,"Saksono 2020, NRIAG J. 9(1):238-244, Depok Indonesia",SQM confirmed; winter in southern hemisphere
+2018-03-24,2018-03-23 20:52:00+00:00,-5.61,120.467,5.0,82,18.18851884462986,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",DSLR; D0=18.19° computed; clear sky; actual dawn time from paper Table 2
+2018-03-25,2018-03-24 20:58:00+00:00,-5.61,120.467,5.0,83,16.657830762947693,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",DSLR; D0=16.66° computed; clear sky; actual dawn time from paper Table 2
+2018-03-26,2018-03-25 20:51:00+00:00,-5.61,120.467,5.0,84,18.360695960774837,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",DSLR; D0=18.36° computed; clear sky; actual dawn time from paper Table 2
+2018-03-27,2018-03-26 20:48:00+00:00,-5.61,120.467,5.0,85,19.06710656813611,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",DSLR; D0=19.07° computed; cloud on horizon per paper; actual dawn time from paper Table 2
+2018-03-28,2018-03-27 20:54:00+00:00,-5.61,120.467,5.0,86,17.53332611830722,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",DSLR; D0=17.53° computed; clear sky; actual dawn time from paper Table 2
+2018-03-29,2018-03-28 20:51:00+00:00,-5.61,120.467,5.0,87,18.237730357599805,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",DSLR; D0=18.24° computed; cloud on horizon per paper; actual dawn time from paper Table 2
 2022-03-21,2022-03-20 20:53:00+00:00,-5.56,120.41,2.0,79,18.10047087603923,"Hisbullah Salam thesis 2022/2023 Walisongo Univ, Bulukumba South Sulawesi",Pristine 21.6-22 mpsas; SOOF+SQM comparison; spring; time inferred
 2022-06-22,2022-06-21 20:51:00+00:00,-5.56,120.41,2.0,172,18.080653082162435,"Hisbullah Salam thesis 2022/2023 Walisongo Univ, Bulukumba South Sulawesi",Pristine Sulawesi coast; SH winter; SOOF confirmed 18°; time inferred
 2022-09-23,2022-09-22 20:38:00+00:00,-5.56,120.41,2.0,265,18.15996865389921,"Hisbullah Salam thesis 2022/2023 Walisongo Univ, Bulukumba South Sulawesi",Pristine Sulawesi; actual obs dates Sep 22-25 Oct 2-3 2022; time inferred
@@ -190,6 +202,9 @@ date,utc_dt,lat,lng,elevation_m,day_of_year,fajr_angle,source,notes
 2015-06-22,2015-06-21 20:08:00+00:00,-0.86,134.08,10.0,172,13.513657338917165,"Saksono T. et al., ISRN/UHAMKA 'Premature Dawn' series, Manokwari West Papua",Urban LP; D0=-13.4° Indonesia mean; summer solstice; time inferred
 2015-09-23,2015-09-22 20:02:00+00:00,-0.86,134.08,10.0,265,13.600101066826493,"Saksono T. et al., ISRN/UHAMKA 'Premature Dawn' series, Manokwari West Papua",Urban LP; D0=-13.4° Indonesia mean; autumn equinox; time inferred
 2015-12-22,2015-12-21 20:01:00+00:00,-0.86,134.08,10.0,355,13.562573446205505,"Saksono T. et al., ISRN/UHAMKA 'Premature Dawn' series, Manokwari West Papua",Urban LP; D0=-13.4° Indonesia mean; winter solstice; time inferred
+2018-03-21,2018-03-20 20:30:00+00:00,-0.691,127.39,5.0,79,16.954882520140718,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Ternate North Maluku Indonesia",DSLR; D0=16.95° computed; clear sky; actual dawn time from paper Table 2
+2018-03-22,2018-03-21 20:25:00+00:00,-0.691,127.39,5.0,80,18.135313378542754,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Ternate North Maluku Indonesia",DSLR; D0=18.14° computed; clear sky; actual dawn time from paper Table 2
+2018-03-23,2018-03-22 20:29:00+00:00,-0.691,127.39,5.0,81,17.064206527995943,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Ternate North Maluku Indonesia",DSLR; D0=17.06° computed; clear sky; actual dawn time from paper Table 2
 2015-03-21,2015-03-20 22:31:00+00:00,-0.47,100.6,891.0,79,13.50712597052334,"Saksono T. et al., ISRN/UHAMKA 'Premature Dawn' series, Batusangkar W. Sumatra",Urban LP; D0=-13.4° Indonesia mean; 891m highland; spring equinox; time inferred
 2015-06-22,2015-06-21 22:21:00+00:00,-0.47,100.6,891.0,172,13.569960295792873,"Saksono T. et al., ISRN/UHAMKA 'Premature Dawn' series, Batusangkar W. Sumatra",Urban LP; D0=-13.4° Indonesia mean; 891m highland; summer solstice; time inferred
 2015-09-23,2015-09-22 22:16:00+00:00,-0.47,100.6,891.0,265,13.571316942116766,"Saksono T. et al., ISRN/UHAMKA 'Premature Dawn' series, Batusangkar W. Sumatra",Urban LP; D0=-13.4° Indonesia mean; 891m highland; autumn equinox; time inferred
@@ -210,18 +225,28 @@ date,utc_dt,lat,lng,elevation_m,day_of_year,fajr_angle,source,notes
 2020-06-22,2020-06-21 20:27:00+00:00,1.49,124.85,50.0,173,16.66300633879127,"Damanhuri & Mukarram LAPAN 2022, Manado North Sulawesi Indonesia",Manado; summer solstice; time inferred
 2020-09-23,2020-09-22 20:26:00+00:00,1.49,124.85,50.0,266,16.755400015241324,"Damanhuri & Mukarram LAPAN 2022, Manado North Sulawesi Indonesia",Manado; autumn equinox; time inferred
 2020-12-22,2020-12-21 20:29:00+00:00,1.49,124.85,50.0,356,16.6476930546721,"Damanhuri & Mukarram LAPAN 2022, Manado North Sulawesi Indonesia",Manado; winter solstice; time inferred
+2018-09-18,2018-09-17 21:40:00+00:00,1.731,103.904,5.0,260,19.60225871979578,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Kota Tinggi Johor Malaysia",DSLR; D0=19.60° computed; clear sky; actual dawn time from paper Table 2
+2018-09-19,2018-09-18 21:40:00+00:00,1.731,103.904,5.0,261,19.529822856100505,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Kota Tinggi Johor Malaysia",DSLR; D0=19.53° computed; clear sky; actual dawn time from paper Table 2
+2018-09-20,2018-09-19 21:39:00+00:00,1.731,103.904,5.0,262,19.70630640651717,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Kota Tinggi Johor Malaysia",DSLR; D0=19.71° computed; clear sky; actual dawn time from paper Table 2
 2018-03-21,2018-03-20 22:07:00+00:00,1.8,104.4,3.0,79,15.679220041688483,"LP2024 Scientific Reports PMC11535048, Tanjung Balau Johor Malaysia",Rural 19.78 mpsas; LP-affected angle 15.67°; spring; time inferred
 2018-06-22,2018-06-21 21:52:00+00:00,1.8,104.4,3.0,172,15.782748634032952,"LP2024 Scientific Reports PMC11535048, Tanjung Balau Johor Malaysia",Rural Johor; summer; 1.8°N; time inferred
 2018-09-23,2018-09-22 21:52:00+00:00,1.8,104.4,3.0,265,15.736863423188806,"LP2024 Scientific Reports PMC11535048, Tanjung Balau Johor Malaysia",Rural Johor; autumn equinox; time inferred
 2018-12-22,2018-12-21 21:55:00+00:00,1.8,104.4,3.0,355,15.763888774187254,"LP2024 Scientific Reports PMC11535048, Tanjung Balau Johor Malaysia",Rural Johor; winter solstice; time inferred
+2018-06-22,2018-06-21 21:37:00+00:00,2.432,103.827,5.0,172,19.41227188539,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Mersing Johor Malaysia",DSLR; D0=19.41° computed; dry season clear sky; South China Sea horizon; actual dawn time from paper Table 2
+2018-06-23,2018-06-22 21:38:00+00:00,2.432,103.827,5.0,173,19.237576136988583,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Mersing Johor Malaysia",DSLR; D0=19.24° computed; dry season clear sky; South China Sea horizon; actual dawn time from paper Table 2
+2018-06-24,2018-06-23 21:38:00+00:00,2.432,103.827,5.0,174,19.288616433108796,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Mersing Johor Malaysia",DSLR; D0=19.29° computed; dry season clear sky; South China Sea horizon; actual dawn time from paper Table 2
 2008-01-16,2008-01-15 22:24:00+00:00,2.46,101.867,15.0,15,14.394345345593194,"Abdel-Hadi & Hassan 2022, IJAA, Teluk Kemang Malaysia SQM",SQM; winter; mean 14.19°; time inferred
 2008-04-16,2008-04-15 22:12:00+00:00,2.46,101.867,15.0,106,14.395231562638005,"Abdel-Hadi & Hassan 2022, IJAA, Teluk Kemang Malaysia SQM",SQM; spring; mean 14.19°; time inferred
 2007-05-16,2007-05-15 22:05:00+00:00,2.46,101.867,15.0,135,14.2440273961132,"Abdel-Hadi & Hassan 2022, IJAA, Teluk Kemang Malaysia SQM",SQM; mean 14.19°; LOWER than typical Malaysian values (16-17°) — different threshold; time inferred
 2007-09-23,2007-09-22 22:08:00+00:00,2.46,101.867,15.0,265,14.285295399078418,"Abdel-Hadi & Hassan 2022, IJAA, Teluk Kemang Malaysia SQM",SQM; autumn equinox; mean 14.19°; time inferred
+2018-07-16,2018-07-15 21:43:00+00:00,2.807,103.491,5.0,196,19.5399144605992,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Kuala Rompin Pahang Malaysia",DSLR; D0=19.54° computed; dry season clear sky; South China Sea horizon; actual dawn time from paper Table 2
+2018-07-17,2018-07-16 21:44:00+00:00,2.807,103.491,5.0,197,19.36480036311112,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Kuala Rompin Pahang Malaysia",DSLR; D0=19.36° computed; dry season clear sky; South China Sea horizon; actual dawn time from paper Table 2
 2017-03-20,2017-03-19 22:00:00+00:00,3.14,101.69,40.0,78,20.184283044634665,"Kassim Bahali 2018, Sains Malaysia 47(11), Kuala Lumpur",Spring equinox; near equator
 2017-06-21,2017-06-20 21:57:00+00:00,3.14,101.69,40.0,171,16.488023722444712,"Kassim Bahali 2018, Sains Malaysia 47(11), Kuala Lumpur",DSLR + SQM confirmed; mean depression ~16.67° across 64 days
 2017-09-22,2017-09-21 22:00:00+00:00,3.14,101.69,40.0,264,16.477962853797283,"Kassim Bahali 2018, Sains Malaysia 47(11), Kuala Lumpur",Autumn equinox; near equator
 2017-12-21,2017-12-20 22:02:00+00:00,3.14,101.69,40.0,354,17.09878948331101,"Kassim Bahali 2018, Sains Malaysia 47(11), Kuala Lumpur",DSLR + SQM winter observation; near equator
+2018-08-14,2018-08-13 21:47:00+00:00,3.31,103.453,5.0,225,19.38879823275996,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Nenasi Pekan Pahang Malaysia",DSLR; D0=19.39° computed; clear sky; actual dawn time from paper Table 2
+2018-08-15,2018-08-14 21:47:00+00:00,3.31,103.453,5.0,226,19.39121270463156,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Nenasi Pekan Pahang Malaysia",DSLR; D0=19.39° computed; clear sky; actual dawn time from paper Table 2
 2017-06-01,2017-05-31 21:48:00+00:00,3.408,103.356,10.0,151,16.2798224810698,"Kassim Bahali 2018, Sains Malaysiana 47(11) Table 2, Pekan Pahang Malaysia",DSLR; individual obs; Do=-17.36°; 82% cloud cover; coastal east horizon
 2017-06-03,2017-06-02 21:42:00+00:00,3.408,103.356,10.0,153,17.665112910795322,"Kassim Bahali 2018, Sains Malaysiana 47(11) Table 2, Pekan Pahang Malaysia",DSLR; individual obs; Do=-17.32°; 71% intermittent cloud
 2017-06-04,2017-06-03 21:40:00+00:00,3.408,103.356,10.0,154,18.13174801979601,"Kassim Bahali 2018, Sains Malaysiana 47(11) Table 2, Pekan Pahang Malaysia",DSLR; individual obs; Do=-18.00°; 81% cloud; dawn seen between clouds
@@ -252,10 +277,23 @@ date,utc_dt,lat,lng,elevation_m,day_of_year,fajr_angle,source,notes
 2018-06-22,2018-06-21 21:43:00+00:00,5.4,102.917,5.0,172,17.569640526576887,"LP2024 Scientific Reports PMC11535048, Balai Cerap UniSZA Terengganu",UniSZA observatory; summer solstice; time inferred
 2018-09-23,2018-09-22 21:50:00+00:00,5.4,102.917,5.0,265,17.642289833683726,"LP2024 Scientific Reports PMC11535048, Balai Cerap UniSZA Terengganu",UniSZA observatory; autumn equinox; time inferred
 2018-12-22,2018-12-21 21:59:00+00:00,5.4,102.917,5.0,355,17.635980446437927,"LP2024 Scientific Reports PMC11535048, Balai Cerap UniSZA Terengganu",UniSZA observatory; winter solstice; time inferred
+2017-12-20,2017-12-19 22:33:00+00:00,5.876,95.34,5.0,353,16.77957717735588,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",DSLR; D0=16.78° computed; Dec 20 clear sky; actual dawn time from paper Table 2
+2017-12-21,2017-12-20 22:37:00+00:00,5.876,95.34,5.0,354,15.976364006435302,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",DSLR; D0=15.98° computed; Dec 21 clear sky; actual dawn time from paper Table 2
+2017-12-22,2017-12-21 22:31:00+00:00,5.876,95.34,5.0,355,17.466253660657696,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",DSLR; D0=17.47° computed; Dec 22 clear sky; actual dawn time from paper Table 2
+2017-12-23,2017-12-22 22:36:00+00:00,5.876,95.34,5.0,356,16.434292331791514,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",DSLR; D0=16.43° computed; Dec 23 clear sky; actual dawn time from paper Table 2
+2017-12-24,2017-12-23 22:33:00+00:00,5.876,95.34,5.0,357,17.23661245547811,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",DSLR; D0=17.24° computed; Dec 24 clear sky; actual dawn time from paper Table 2
+2017-12-25,2017-12-24 22:33:00+00:00,5.876,95.34,5.0,358,17.35101641652853,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",DSLR; D0=17.35° computed; Dec 25 clear sky; actual dawn time from paper Table 2
+2017-12-26,2017-12-25 22:32:00+00:00,5.876,95.34,5.0,359,17.694609082726025,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",DSLR; D0=17.70° computed; Dec 26 clear sky; actual dawn time from paper Table 2
+2017-12-27,2017-12-26 22:34:00+00:00,5.876,95.34,5.0,360,17.34970502020789,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",DSLR; D0=17.35° computed; Dec 27 clear sky; actual dawn time from paper Table 2
+2017-12-28,2017-12-27 22:31:00+00:00,5.876,95.34,5.0,361,18.151651191037427,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",DSLR; D0=18.15° computed; Dec 28 clear sky; actual dawn time from paper Table 2
+2017-12-29,2017-12-28 22:32:00+00:00,5.876,95.34,5.0,362,18.03519646568871,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",DSLR; D0=18.04° computed; Dec 29 clear sky; actual dawn time from paper Table 2
+2017-12-30,2017-12-29 22:31:00+00:00,5.876,95.34,5.0,363,18.3773086883836,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",DSLR; D0=18.38° computed; Dec 30 clear sky; actual dawn time from paper Table 2
 2018-03-21,2018-03-20 22:08:00+00:00,6.317,102.15,3.0,79,17.568166913263454,"LP2024 Scientific Reports PMC11535048, Pantai Mek Mas Kelantan Malaysia",Pristine dark sky 21.30 mpsas; twilight stability -17.49°; time inferred
 2018-06-22,2018-06-21 21:44:00+00:00,6.317,102.15,3.0,172,17.61402480335092,"LP2024 Scientific Reports PMC11535048, Pantai Mek Mas Kelantan Malaysia",Pristine dark sky; summer solstice; time inferred
 2018-09-23,2018-09-22 21:53:00+00:00,6.317,102.15,3.0,265,17.6280830402101,"LP2024 Scientific Reports PMC11535048, Pantai Mek Mas Kelantan Malaysia",Pristine dark sky; autumn equinox; time inferred
 2018-12-22,2018-12-21 22:04:00+00:00,6.317,102.15,3.0,355,17.54809981748196,"LP2024 Scientific Reports PMC11535048, Pantai Mek Mas Kelantan Malaysia",Pristine dark sky; winter solstice; time inferred
+2018-01-20,2018-01-19 22:23:00+00:00,6.934,101.319,5.0,19,17.033919761668812,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Yaring Pattani Thailand",DSLR; D0=17.03° computed; clear sky; actual dawn time from paper Table 2
+2018-01-21,2018-01-20 22:23:00+00:00,6.934,101.319,5.0,20,17.09786228513118,"Kassim Bahali et al. 2019, JATMA 7(2):37-48, Yaring Pattani Thailand",DSLR; D0=17.10° computed; clear sky; actual dawn time from paper Table 2
 2018-03-21,2018-03-20 21:10:00+00:00,7.2,116.5,5.0,79,17.68723930861158,"LP2024 Scientific Reports PMC11535048, Simpang Mengayau Sabah",Pristine 21.64 mpsas; northernmost Borneo; spring; time inferred
 2018-06-22,2018-06-21 20:45:00+00:00,7.2,116.5,5.0,172,17.561065224073936,"LP2024 Scientific Reports PMC11535048, Simpang Mengayau Sabah",Pristine Borneo; summer; 7.2°N; time inferred
 2018-09-23,2018-09-22 20:56:00+00:00,7.2,116.5,5.0,265,17.496116955256284,"LP2024 Scientific Reports PMC11535048, Simpang Mengayau Sabah",Pristine Borneo; autumn equinox; time inferred

src/collect/verified_sightings.py

@@ -4193,6 +4193,323 @@ VERIFIED_SIGHTINGS: list[SightingRecord] = [
         "notes": "SQM; D0=-18.5° multi-site mean; 700m highland; winter solstice; time inferred",
     },
 
+    # =========================================================================
+    # BATCH 6 — Kassim Bahali et al. 2019 JATMA per-date DSLR records
+    # "Re-evaluation of Calculation of the Dawn Prayer Time in the Malay World"
+    # Source: Bahali K. et al. (2019), JATMA 7(2):37-48
+    #   DOI: 10.17576/jatma-2019-0702-04
+    # DSLR camera (Canon 60Da), 22 sites in Malaysia, Indonesia, Thailand.
+    # Feb 2017 - Sep 2018. 118 days, 112 valid (6 TD).
+    # Mean D0 = 17.15° (from paper's mean time difference of 11.4 min).
+    # Per-date times extracted from PDF Table 2 (rows 51-118), depression angles
+    # computed via PyEphem from actual local dawn time + site coordinates.
+    # =========================================================================
+
+    # -----------------------------------------------------------------------
+    # SABANG, ACEH, INDONESIA (5.876°N, 95.340°E, 5m, UTC+7)
+    # Westernmost city of Indonesia. Sabang island, Weh Island, Indian Ocean.
+    # Excellent dark sky horizon — facing west over Indian Ocean.
+    # 11 individual DSLR observations Dec 20-30, 2017.
+    # Mean D0 computed: 17.35°
+    # -----------------------------------------------------------------------
+    {
+        "prayer": "fajr", "date_local": "2017-12-20", "time_local": "05:33",
+        "utc_offset": 7.0, "lat": 5.876, "lng": 95.340, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",
+        "notes": "DSLR; D0=16.78° computed; Dec 20 clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2017-12-21", "time_local": "05:37",
+        "utc_offset": 7.0, "lat": 5.876, "lng": 95.340, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",
+        "notes": "DSLR; D0=15.98° computed; Dec 21 clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2017-12-22", "time_local": "05:31",
+        "utc_offset": 7.0, "lat": 5.876, "lng": 95.340, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",
+        "notes": "DSLR; D0=17.47° computed; Dec 22 clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2017-12-23", "time_local": "05:36",
+        "utc_offset": 7.0, "lat": 5.876, "lng": 95.340, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",
+        "notes": "DSLR; D0=16.43° computed; Dec 23 clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2017-12-24", "time_local": "05:33",
+        "utc_offset": 7.0, "lat": 5.876, "lng": 95.340, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",
+        "notes": "DSLR; D0=17.24° computed; Dec 24 clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2017-12-25", "time_local": "05:33",
+        "utc_offset": 7.0, "lat": 5.876, "lng": 95.340, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",
+        "notes": "DSLR; D0=17.35° computed; Dec 25 clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2017-12-26", "time_local": "05:32",
+        "utc_offset": 7.0, "lat": 5.876, "lng": 95.340, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",
+        "notes": "DSLR; D0=17.70° computed; Dec 26 clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2017-12-27", "time_local": "05:34",
+        "utc_offset": 7.0, "lat": 5.876, "lng": 95.340, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",
+        "notes": "DSLR; D0=17.35° computed; Dec 27 clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2017-12-28", "time_local": "05:31",
+        "utc_offset": 7.0, "lat": 5.876, "lng": 95.340, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",
+        "notes": "DSLR; D0=18.15° computed; Dec 28 clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2017-12-29", "time_local": "05:32",
+        "utc_offset": 7.0, "lat": 5.876, "lng": 95.340, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",
+        "notes": "DSLR; D0=18.04° computed; Dec 29 clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2017-12-30", "time_local": "05:31",
+        "utc_offset": 7.0, "lat": 5.876, "lng": 95.340, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sabang Aceh Indonesia",
+        "notes": "DSLR; D0=18.38° computed; Dec 30 clear sky; actual dawn time from paper Table 2",
+    },
+
+    # -----------------------------------------------------------------------
+    # YARING, PATTANI, THAILAND (6.934°N, 101.319°E, 5m, UTC+7)
+    # Southern Thailand (predominantly Muslim region). Coastal DSLR observation.
+    # Coordinates from paper: 6°56'02"N, 101°19'07"E
+    # 2 observations Jan 20-21, 2018.
+    # Mean D0 computed: 17.07°
+    # -----------------------------------------------------------------------
+    {
+        "prayer": "fajr", "date_local": "2018-01-20", "time_local": "05:23",
+        "utc_offset": 7.0, "lat": 6.934, "lng": 101.319, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Yaring Pattani Thailand",
+        "notes": "DSLR; D0=17.03° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-01-21", "time_local": "05:23",
+        "utc_offset": 7.0, "lat": 6.934, "lng": 101.319, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Yaring Pattani Thailand",
+        "notes": "DSLR; D0=17.10° computed; clear sky; actual dawn time from paper Table 2",
+    },
+
+    # -----------------------------------------------------------------------
+    # SURABAYA, EAST JAVA, INDONESIA (-7.244°S, 112.802°E, 5m, UTC+7)
+    # Second largest Indonesian city. Coastal Java Sea horizon.
+    # Coordinates from paper: 7°14'39"S, 112°48'08"E
+    # 3 observations Feb 21-23, 2018.
+    # Mean D0 computed: 18.54°
+    # -----------------------------------------------------------------------
+    {
+        "prayer": "fajr", "date_local": "2018-02-21", "time_local": "04:20",
+        "utc_offset": 7.0, "lat": -7.244, "lng": 112.802, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Surabaya East Java Indonesia",
+        "notes": "DSLR; D0=18.65° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-02-22", "time_local": "04:21",
+        "utc_offset": 7.0, "lat": -7.244, "lng": 112.802, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Surabaya East Java Indonesia",
+        "notes": "DSLR; D0=18.46° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-02-23", "time_local": "04:21",
+        "utc_offset": 7.0, "lat": -7.244, "lng": 112.802, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Surabaya East Java Indonesia",
+        "notes": "DSLR; D0=18.50° computed; clear sky; actual dawn time from paper Table 2",
+    },
+
+    # -----------------------------------------------------------------------
+    # SUMENEP, MADURA, INDONESIA (-7.255°S, 112.803°E, 5m, UTC+7)
+    # Western Madura coast facing Surabaya Strait.
+    # Coordinates from paper: 7°15'16"S, 112°48'09"E (western Madura observation point)
+    # 3 observations Feb 24-26, 2018.
+    # Mean D0 computed: 16.46° (high variance, range 14.90°-18.35°)
+    # -----------------------------------------------------------------------
+    {
+        "prayer": "fajr", "date_local": "2018-02-24", "time_local": "04:36",
+        "utc_offset": 7.0, "lat": -7.255, "lng": 112.803, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sumenep Madura Indonesia",
+        "notes": "DSLR; D0=14.90° computed; partial cloud possible; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-02-25", "time_local": "04:31",
+        "utc_offset": 7.0, "lat": -7.255, "lng": 112.803, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sumenep Madura Indonesia",
+        "notes": "DSLR; D0=16.14° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-02-26", "time_local": "04:22",
+        "utc_offset": 7.0, "lat": -7.255, "lng": 112.803, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Sumenep Madura Indonesia",
+        "notes": "DSLR; D0=18.35° computed; clear sky; actual dawn time from paper Table 2",
+    },
+
+    # -----------------------------------------------------------------------
+    # TERNATE, NORTH MALUKU, INDONESIA (-0.691°S, 127.390°E, 5m, UTC+9)
+    # Coordinates from paper: 0°41'26"S, 127°23'24"E
+    # (Observation site in North Maluku just south of equator)
+    # 3 observations Mar 21-23, 2018.
+    # Mean D0 computed: 17.38°
+    # -----------------------------------------------------------------------
+    {
+        "prayer": "fajr", "date_local": "2018-03-21", "time_local": "05:30",
+        "utc_offset": 9.0, "lat": -0.691, "lng": 127.390, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Ternate North Maluku Indonesia",
+        "notes": "DSLR; D0=16.95° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-03-22", "time_local": "05:25",
+        "utc_offset": 9.0, "lat": -0.691, "lng": 127.390, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Ternate North Maluku Indonesia",
+        "notes": "DSLR; D0=18.14° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-03-23", "time_local": "05:29",
+        "utc_offset": 9.0, "lat": -0.691, "lng": 127.390, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Ternate North Maluku Indonesia",
+        "notes": "DSLR; D0=17.06° computed; clear sky; actual dawn time from paper Table 2",
+    },
+
+    # -----------------------------------------------------------------------
+    # SOUTH SULAWESI / GOWA AREA, INDONESIA (-5.610°S, 120.467°E, 5m, UTC+8)
+    # Coordinates from paper: 5°36'36"S, 120°28'03"E
+    # Rural/coastal area in Gowa Regency near Makassar.
+    # 6 observations Mar 24-29, 2018.
+    # Mean D0 computed: 18.01°
+    # Note: Mar 27 and 29 had cloud issues per paper text but times still recorded.
+    # -----------------------------------------------------------------------
+    {
+        "prayer": "fajr", "date_local": "2018-03-24", "time_local": "04:52",
+        "utc_offset": 8.0, "lat": -5.610, "lng": 120.467, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",
+        "notes": "DSLR; D0=18.19° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-03-25", "time_local": "04:58",
+        "utc_offset": 8.0, "lat": -5.610, "lng": 120.467, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",
+        "notes": "DSLR; D0=16.66° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-03-26", "time_local": "04:51",
+        "utc_offset": 8.0, "lat": -5.610, "lng": 120.467, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",
+        "notes": "DSLR; D0=18.36° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-03-27", "time_local": "04:48",
+        "utc_offset": 8.0, "lat": -5.610, "lng": 120.467, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",
+        "notes": "DSLR; D0=19.07° computed; cloud on horizon per paper; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-03-28", "time_local": "04:54",
+        "utc_offset": 8.0, "lat": -5.610, "lng": 120.467, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",
+        "notes": "DSLR; D0=17.53° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-03-29", "time_local": "04:51",
+        "utc_offset": 8.0, "lat": -5.610, "lng": 120.467, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, South Sulawesi Gowa Indonesia",
+        "notes": "DSLR; D0=18.24° computed; cloud on horizon per paper; actual dawn time from paper Table 2",
+    },
+
+    # -----------------------------------------------------------------------
+    # MERSING, JOHOR, MALAYSIA (2.432°N, 103.827°E, 5m, UTC+8)
+    # East coast Johor. South China Sea horizon — dry season (Jun-Sep) clear sky.
+    # 3 observations Jun 22-24, 2018.
+    # Mean D0 computed: 19.31°
+    # -----------------------------------------------------------------------
+    {
+        "prayer": "fajr", "date_local": "2018-06-22", "time_local": "05:37",
+        "utc_offset": 8.0, "lat": 2.432, "lng": 103.827, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Mersing Johor Malaysia",
+        "notes": "DSLR; D0=19.41° computed; dry season clear sky; South China Sea horizon; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-06-23", "time_local": "05:38",
+        "utc_offset": 8.0, "lat": 2.432, "lng": 103.827, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Mersing Johor Malaysia",
+        "notes": "DSLR; D0=19.24° computed; dry season clear sky; South China Sea horizon; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-06-24", "time_local": "05:38",
+        "utc_offset": 8.0, "lat": 2.432, "lng": 103.827, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Mersing Johor Malaysia",
+        "notes": "DSLR; D0=19.29° computed; dry season clear sky; South China Sea horizon; actual dawn time from paper Table 2",
+    },
+
+    # -----------------------------------------------------------------------
+    # KUALA ROMPIN, PAHANG, MALAYSIA (2.807°N, 103.491°E, 5m, UTC+8)
+    # East coast Pahang. South China Sea horizon — dry season clear sky.
+    # 2 observations Jul 16-17, 2018 (3 TD days skipped).
+    # Mean D0 computed: 19.45°
+    # -----------------------------------------------------------------------
+    {
+        "prayer": "fajr", "date_local": "2018-07-16", "time_local": "05:43",
+        "utc_offset": 8.0, "lat": 2.807, "lng": 103.491, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Kuala Rompin Pahang Malaysia",
+        "notes": "DSLR; D0=19.54° computed; dry season clear sky; South China Sea horizon; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-07-17", "time_local": "05:44",
+        "utc_offset": 8.0, "lat": 2.807, "lng": 103.491, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Kuala Rompin Pahang Malaysia",
+        "notes": "DSLR; D0=19.36° computed; dry season clear sky; South China Sea horizon; actual dawn time from paper Table 2",
+    },
+
+    # -----------------------------------------------------------------------
+    # NENASI, PEKAN, PAHANG, MALAYSIA (3.310°N, 103.453°E, 5m, UTC+8)
+    # Coastal Pahang. South China Sea horizon.
+    # 2 observations Aug 14-15, 2018 (1 TD skipped).
+    # Mean D0 computed: 19.39°
+    # -----------------------------------------------------------------------
+    {
+        "prayer": "fajr", "date_local": "2018-08-14", "time_local": "05:47",
+        "utc_offset": 8.0, "lat": 3.310, "lng": 103.453, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Nenasi Pekan Pahang Malaysia",
+        "notes": "DSLR; D0=19.39° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-08-15", "time_local": "05:47",
+        "utc_offset": 8.0, "lat": 3.310, "lng": 103.453, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Nenasi Pekan Pahang Malaysia",
+        "notes": "DSLR; D0=19.39° computed; clear sky; actual dawn time from paper Table 2",
+    },
+
+    # -----------------------------------------------------------------------
+    # KOTA TINGGI, JOHOR, MALAYSIA (1.731°N, 103.904°E, 5m, UTC+8)
+    # Inland Johor near river mouth, eastern Johor. Clear Sep 2018 dry season.
+    # 3 observations Sep 18-20, 2018.
+    # Mean D0 computed: 19.61°
+    # -----------------------------------------------------------------------
+    {
+        "prayer": "fajr", "date_local": "2018-09-18", "time_local": "05:40",
+        "utc_offset": 8.0, "lat": 1.731, "lng": 103.904, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Kota Tinggi Johor Malaysia",
+        "notes": "DSLR; D0=19.60° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-09-19", "time_local": "05:40",
+        "utc_offset": 8.0, "lat": 1.731, "lng": 103.904, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Kota Tinggi Johor Malaysia",
+        "notes": "DSLR; D0=19.53° computed; clear sky; actual dawn time from paper Table 2",
+    },
+    {
+        "prayer": "fajr", "date_local": "2018-09-20", "time_local": "05:39",
+        "utc_offset": 8.0, "lat": 1.731, "lng": 103.904, "elevation_m": 5.0,
+        "source": "Kassim Bahali et al. 2019, JATMA 7(2):37-48, Kota Tinggi Johor Malaysia",
+        "notes": "DSLR; D0=19.71° computed; clear sky; actual dawn time from paper Table 2",
+    },
+
 ]