What is the evidence of sighting the crescent?

Answer

The evidence could be one or more of the following: 1. You have sighted it yourself. 2. The testimony of two men of impeccable character, provided that you do not have any knowledge of instances that they may be wrong, and that you do not dispute their testimony. 3. The lapse of thirty days on the month of Sha’ban, thus reaching certitude that Sha’ban has come to an end and that the month of Ramadhan shall commence. 4. When the news of the birth of the moon of Ramadhan becomes commonplace that you are sure of the sighting.