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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
35 lines
2.1 KiB
Markdown
35 lines
2.1 KiB
Markdown
# Naked Eye Observations for Morning Twilight at Different Sites in Egypt
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**Authors:** A.H. Hassan, N.Y. Hassanin, Y.A. Abdel-Hadi, and I.A. Issa
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**Year:** 2014
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**Journal:** NRIAG Journal of Astronomy and Geophysics, 3: 23-26
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**DOI:** 10.1016/j.nrjag.2014.02.002
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**URL:** https://www.tandfonline.com/doi/full/10.1016/j.nrjag.2014.02.002
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**Sites studied:** 4 sites in Egypt: Bahria, Matrouh, Kottamia, Aswan
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**Observation method:** Naked eye
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**Date range:** Multiple years (appears to be part of the 2007-2013 NRIAG campaign)
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## Sites (from Tubruq 2015 paper Table 2)
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| Site | Lat | Lng | Elevation | Background | D0 range |
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|------|-----|-----|-----------|------------|----------|
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| Bahria | 28 42.9'N | 29 59.82'E | 150m | Desert | 12.6-15.0 |
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| Matrouh | 31 0.2'N | 27 51'E | 75m | Sea-Desert | 12.3-14.5 |
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| Kottamia | 29 55.9'N | 31 49.5'E | 470m | Desert | 14.46-14.86 |
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| Aswan | 23 48.22'N | 32 29.5'E | 250m | Desert | 12.46-13.96 |
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## Summary
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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.
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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).
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## Data Availability
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**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).
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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).
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## For ML Training
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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).
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