CRESCENT'S VISIBILITY WORLD MAP - JUMADIL AWAL 1429 AH Click on the map to view the current diagram of crescent's visibility.

 Odeh Criterion

(Accurate Times Software)

1. Blue: Need Optical Aid : Crescent is visible by optical aid only.

2. Magenta: Could be Seen by Naked Eye: Crescent is visible by optical aid, and it could be seen by naked eye.

3. Green: Easily Visible by Naked Eye: Crescent is easily visible by naked eye.

4. Red: Impossible Sighting: This happens if Moonset occurs before Sunset, or the topocentric conjunction occurs after Sunset.

5. No Color: Not Possible Sighting: This happens when the topocentric conjunction occurs before Sunset, and Moonset occurs after Sunset, but the brightness of the crescent is not enough to be seen even by optical aid.

6. Cyan: Unknown: This happens at high latitudes when there is no Moonset/Moonrise event on the visibility day. In such a case, determining the visibility of the crescent needs more sophisticated algorithm than what is currently adopted in Accurate Times.