Hilal Astro
Crescent Moon Calculator
About
This offline-first Islamic astronomy app calculates crescent moon visibility using three international criteria. It provides detailed astronomical data, moon phases, planet positions, and an augmented reality sky view. Supports multiple cities and languages, with no ads or internet required.
What's New in Hilal Astro
2.8.0
November 4, 2026
New in 2.8: a full-screen visibility map with pinch zoom, day steps, criterion and evening/morning switches, and moon-age lines in hours. The map on its page is taller and opens on your city's longitude. The sighting calendar shows years before the Hijra as negative years, down to -600, with no year 0. Fixes: Yallop's q, the moonset lag when the moon is below the horizon at sunset, planet rise and set times, three Umm al-Qura months, and quick day steps on the map.
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FAQ
What is Hilal Astro?
Hilal Astro is an offline-first Islamic astronomy calculator designed to determine crescent moon visibility based on internationally recognized criteria. It also provides detailed astronomical data for celestial objects.
How does Hilal Astro calculate crescent moon visibility?
Hilal Astro uses three internationally recognized criteria: Yallop (1998), Odeh (2006), and MABIMS (2021) to calculate crescent moon visibility. Users can select a city, use GPS, or enter custom coordinates for the calculation.
Does Hilal Astro require an internet connection?
No, Hilal Astro is an offline-first application and does not require an internet connection to function. This ensures privacy and accessibility without data usage.
What astronomical data does Hilal Astro provide?
Hilal Astro offers detailed data including moon altitude, azimuth, elongation, crescent age, lag time, and relative altitude after sunset, along with charts. It also tracks the seven visible planets.
Can I see celestial objects in AR with Hilal Astro?
Yes, Hilal Astro features an AR Sky View mode. By holding your phone up, you can see planets, stars, and Messier objects overlaid on your live camera view in their real positions, with magnetic declination corrected.
How many cities does Hilal Astro support?
Hilal Astro supports 42 cities worldwide, including major locations like Mecca, Medina, Cairo, Jakarta, Kuala Lumpur, and New York, allowing for localized visibility calculations.
Is Hilal Astro suitable for all ages?
Hilal Astro has an age rating of 4+, making it suitable for a wide range of users. The app provides astronomical information and calculations.
How often is Hilal Astro updated?
The latest version of Hilal Astro is 2.8.0, which was last updated on 2026-11-04. Updates typically include improvements to calculations and features.
