mirror of
https://github.com/acamarata/pray-calc-ml.git
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64 lines
2.7 KiB
Markdown
64 lines
2.7 KiB
Markdown
# pray-calc-ml
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A Python data science project that compiles human-verified Islamic prayer sighting records and
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back-calculates solar depression angles. The goal is to find the real empirical patterns in how
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the Fajr and Isha angles vary with latitude, season, and elevation, then use machine learning
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to refine the DPC (Dynamic Pray Calc) algorithm in [pray-calc](https://github.com/acamarata/pray-calc).
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## Pages
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- [Data Collection](Data-Collection) — how to run the pipeline, add new sources, and expand the dataset
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- [ML Crunching](ML-Crunching) — how to run the analysis notebook and train ML models
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- [Architecture](Architecture) — how the pipeline works, data schema, quality filters
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- [Data Sources](Data-Sources) — full citation table for all sighting records in the dataset
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- [Data](Data) — sources log: all sources searched and their current ingestion status
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- [Research](Research) — academic paper summaries and open questions about the data
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- [Research Notes](Research-Notes) — detailed per-paper notes and regional analysis
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## Quick start
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```bash
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git clone https://github.com/acamarata/pray-calc-ml.git
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cd pray-calc-ml
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python -m venv .venv && source .venv/bin/activate
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pip install -r requirements.txt
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# Generate datasets (requires network for OpenFajr iCal + elevation API)
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python -m src.pipeline
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# Or skip the elevation API:
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python -m src.pipeline --no-elevation-lookup
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```
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Output: `data/processed/fajr_angles.csv` and `data/processed/isha_angles.csv`
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## Current dataset
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| Dataset | Records | Locations | Latitude range | Date range |
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| --- | --- | --- | --- | --- |
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| Fajr | 48,668 | 4,200+ | -62.6° to 69.7° | 1970-2026 |
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| Isha | 34,529 | 2,800+ | -65.9° to 69.3° | 1985-2026 |
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Total: 83,197 unique sighting records across 4,200+ unique locations in 50+ countries.
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Target: 100,000 per dataset. Only human-verified observational records are included. Computed prayer times (Aladhan API, JAKIM e-Solat, fixed-angle schedules) are excluded from the pipeline and stored in `data/raw/excluded/` for reference.
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## Key finding
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Near-equatorial sites (Malaysia, Indonesia, 2-7°) show mean Fajr angles of 16-17°, while
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high-latitude sites (Birmingham, UK, 52°N) average ~13°. Seasonality is a significant second
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factor: at 52°N, the Fajr angle has a ~3° peak-to-trough seasonal swing. Elevation shows a
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smaller but real positive correlation. Desert sites across Saudi Arabia, Mauritania, and Egypt
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cluster tightly around 14-15° with low variance (SD ~0.3-0.6°).
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The 18° fixed angle commonly used by ISNA and MWL overstates the observed true dawn angle at
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virtually all well-documented sites.
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---
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*Part of the [acamarata](https://github.com/acamarata) Islamic computing library suite.*
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---
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*[Data Collection →](Data-Collection)*
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