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Crescent Finder

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

Visibility Predictor

Calculate crescent visibility for any location and date using your chosen prediction model.

Open predictor 🗺️

World Visibility Maps

Interactive world maps showing crescent visibility zones by model.

Live Sky Alignment

The perfect tool to use while you're out spotting the new moon. Use your phone's GPS and compass to align yourself with the moon and make spotting much easier — with live data updating in real time.