mirror of
https://github.com/acamarata/pray-calc-ml.git
synced 2026-07-03 04:10:39 +00:00
c1eeef53c4
Major additions: - Extract all 1,621 Basthoni 2022 SQM records (46 Indonesian sites, Lampiran 2-5) via precomputed_angles.py - Add 9 new raw sighting CSVs: Abdel-Hadi Malaysia, BRIN multistation, Kassim Bahali (2017+2019), Khalifa Saudi, Moonsighting.com, Shaukat 2015 Blackburn UK, Walisongo Sulawesi - Curate aggregate D0 database (115 entries) in research/ Pipeline improvements: - Open-Topo-Data SRTM30m primary elevation API with fallback - APPROVED_RAW_CSVS allowlist prevents circular data ingestion - Pre-computed angle merge path (bypasses back-calculation for SQM data) - BAD_NOTE_MARKERS quality filter for excluded sources Collection tools: - BRIN multistation SQM processors - PDF/HTML table extractor for academic papers - Source tracking database (collection_manifest.json) Documentation: - Rewrite .wiki/Data.md and .wiki/Research.md from scratch - Expand Data-Sources.md with full Basthoni Lampiran breakdown - Add 14 researcher outreach drafts - Update .gitignore to exclude bulk/experimental files
31 lines
2 KiB
Text
31 lines
2 KiB
Text
To: oif@umsu.ac.id
|
|
Subject: Request for Raw SQM Observation Data — Fajr/Isha Twilight Research Collaboration
|
|
|
|
Assalamu alaykum wa rahmatullahi wa barakatuh,
|
|
|
|
My name is Ali Camarata. I am an independent researcher working on an open-source project to build the largest empirical dataset of verified Fajr and Isha twilight observations worldwide. The goal is to develop data-driven models for Islamic prayer time calculation based on real human and instrument observations rather than fixed-angle assumptions.
|
|
|
|
I recently read Lubis, Nafilah & Jihad (2025) in Al-Hisab 2(4):215-229, which used SQM data from OIF UMSU for November 2024. The paper references your observatory's continuous SQM monitoring program running since 2016-2017.
|
|
|
|
I am writing to ask whether OIF UMSU would be willing to share raw per-night SQM observation data from your Medan site (3.595 N, 98.672 E) for the years 2016-2024. Specifically, I need:
|
|
|
|
- Date of each observation night
|
|
- Local time when dawn brightness first exceeded the night baseline (Fajr onset)
|
|
- Local time when evening brightness dropped below the twilight threshold (Isha onset), if recorded
|
|
- Sky condition notes (clear, cloudy, etc.) for each night
|
|
|
|
Even a simple CSV or spreadsheet with date, Fajr time, and Isha time columns would be extremely valuable. The data would be used in an open-source research project (MIT licensed) with full attribution to OIF UMSU and the relevant researchers.
|
|
|
|
Our project repository: https://github.com/acamarata/pray-calc-ml
|
|
Current dataset: 4,200+ Fajr and 19 Isha verified observation records from 140+ sites worldwide.
|
|
|
|
Your data from Medan would be particularly valuable because:
|
|
1. It spans multiple years at a single equatorial site
|
|
2. It documents urban light pollution effects on twilight angles
|
|
3. North Sumatra is underrepresented in global twilight datasets
|
|
|
|
Please let me know if this collaboration is possible. I am happy to share our dataset and findings in return.
|
|
|
|
Jazakallahu khairan,
|
|
Ali Camarata
|
|
alisalaah@gmail.com
|