When has the earliest crescent of a new moon been seen after the moon was born?
Moon sighting does not depend on age. Non-Muslims have treated this question as a sport, who can see the youngest moon. In the zeal of their competition, they claim early and early sightings, which are in most cases false, as many claims have been refuted with no sighting at places thousands of miles west. The authentic sightings are at about 17.2 hours with the naked eye, and 15.5 hours by observatory telescopes. Remember, in some seasons, earliest moon-sighting takes about 24 hours. So if the moon has become 17 hours old or more, one can not conclude that it is possible to see that moon.
