ada08e7ec4
Add 6 new data collection pipelines and their processed outputs: Sources added: - TESS/Stars4All photometer network: 37 months (Jun 2017-Aug 2020), ~40k raw events from 100+ European stations via Zenodo archives - Globe at Night citizen science: 26k twilight observations (2006-2024), filtered from 308k total observations for solar depression 6-22 deg - GaN-MN continuous monitoring: 45 months (Jan 2022-Sep 2025), ~12.5k twilight events from 88 stations across 20+ countries - Galicia SQM network: 14 stations, 1-min resolution, 7.5k events - Madrid/Majadahonda SQM: multi-year continuous monitoring, 3.1k events - washetdonker.nl Netherlands: 7 stations, 3.3k morning events - Academic papers: Jordan (Abed 2015), Fayum Egypt, India photometer Pipeline changes: - ingest.py: add all new files to APPROVED_RAW_CSVS allowlist, fix filter to use allowlist instead of hardcoded exclusions - .gitignore: exclude bulk raw data directories (BSRN, TESS, GaN-MN, washetdonker, Globe at Night downloads) Final dataset: 56,668 Fajr + 34,763 Isha = 91,431 total records Previous: 5,871 Fajr + 46 Isha = 5,917 total records
2.1 KiB
Naked Eye Observations for Morning Twilight at Different Sites in Egypt
Authors: A.H. Hassan, N.Y. Hassanin, Y.A. Abdel-Hadi, and I.A. Issa Year: 2014 Journal: NRIAG Journal of Astronomy and Geophysics, 3: 23-26 DOI: 10.1016/j.nrjag.2014.02.002 URL: https://www.tandfonline.com/doi/full/10.1016/j.nrjag.2014.02.002 Sites studied: 4 sites in Egypt: Bahria, Matrouh, Kottamia, Aswan Observation method: Naked eye Date range: Multiple years (appears to be part of the 2007-2013 NRIAG campaign)
Sites (from Tubruq 2015 paper Table 2)
| Site | Lat | Lng | Elevation | Background | D0 range |
|---|---|---|---|---|---|
| Bahria | 28 42.9'N | 29 59.82'E | 150m | Desert | 12.6-15.0 |
| Matrouh | 31 0.2'N | 27 51'E | 75m | Sea-Desert | 12.3-14.5 |
| Kottamia | 29 55.9'N | 31 49.5'E | 470m | Desert | 14.46-14.86 |
| Aswan | 23 48.22'N | 32 29.5'E | 250m | Desert | 12.46-13.96 |
Summary
Part of the extensive NRIAG naked-eye twilight observation campaign. Reports D0 ranges (not single mean values) for each of the four sites, suggesting per-observer or per-season variation was recorded. The mean D0 across all four locations is reported elsewhere (Tubruq 2015 paper, Fayum 2022 paper) as 14.7 degrees.
Kottamia (470m elevation, desert) shows the narrowest range (14.46-14.86), suggesting the most consistent conditions at this elevated desert observatory. Aswan (250m, southern Egypt near Tropic of Cancer) shows the widest range and lowest values (12.46-13.96).
Data Availability
COULD NOT ACCESS FULL TEXT. Taylor & Francis returned 403. The data known is from cross-references in other papers (particularly the Tubruq 2015 paper's Table 2 and the Fayum 2022 paper's Table 1).
If the full text can be obtained, it may contain per-night observation tables that would be extremely valuable (4 sites, likely dozens of observations per site).
For ML Training
Already partially covered in the aggregate D0 database. If per-night data can be extracted from the full text, this would add significant value for the Egypt latitude band (23-31 deg N).