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Hilal Info

Tools and data for Islamic crescent moon sighting — astronomical calculations, historical reports, and world visibility maps.

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Visibility Predictor
Calculate crescent visibility for any location and date using the Yallop and Odeh models. Enter a zip code or coordinates and get sunset times, moon altitude, ARCV, and more.
Open predictor 🗺️
World Visibility Maps
Interactive world maps showing crescent visibility zones by model. Load pre-generated maps for any new moon from 2020–2030, toggling between D−1, D+0, D+1, and D+2.
View maps 🧭
Live Sky Alignment
Use your phone's GPS, compass, and level sensors to see in real time whether you're pointed at the moon, with red/yellow/green indicators.
Open live tool