Open, research-grade crescent-moon science: the ummah's eyes on the sky, with sensor-attested physics — positive and negative sightings. Documentation, never a verdict.
Aggregate figures for the selected lunar month. Declared and undeclared reports are separated everywhere.
Each report placed by its arc of vision (ARCV) and topocentric crescent width (W), over the Yallop 1997 / Odeh 2004 criterion curves. Watching the crowd trace the criterion in real time is this page's signature.
Every report as a coarse geohash-5 pin (±2.4 km; exact coordinates never leave the device). Filled = declared, outline = undeclared. The terminator sweeps west as the ummah searches.
The network never adjudicates between authorities; it records what the sky showed. Each body applies its own stated criterion. Automated official-calendar feeds are a planned integration (RP3).
| Authority | Stated criterion (summary) |
|---|---|
| Umm al-Qurā (Saudi) | moon sets after sun at Makkah & born before sunset — an astronomical, not sighting, rule |
| MABIMS (2021) | elongation ≥ 6.4° AND moon altitude ≥ 3° |
| Turkey (Diyanet) | altitude ≥ 5° AND elongation ≥ 8° (post-2016 int'l criterion) |
| Morocco (Ḥabous) | actual naked-eye sighting reported to the authority |
| Moonsighting.com | global visibility curve (Odeh/Yallop), actual reports collated |
Where an authority publishes a month-start and the network's first corroborated (P3+/P4) sighting differ, the offset is shown as information, never a verdict.
Monthly frozen snapshots under CC-BY 4.0. Public schema only: rounded time, geohash-5, result, method, witness class, plausibility + physics components. No photos, no keys, no gate artifacts.
Cite as: Hilal Network / Sakan — al-Marṣad open moonsighting dataset (YEAR), sakan.athanapp.site
A sensor-attested corpus with systematic negative reports and per-witness cryptographic consistency is novel — no existing hilāl corpus has it. Designed to grow with the data.
Every plausibility score comes from published formulas, computed server-side and independently of the client's own numbers (an observer cannot inflate their own score). The relay uses skyfield + JPL DE421.