What is the record time between a new moon and its first possible sighting, and is this result available for every point on earth?
No, this result is certainly not available for every point on earth. According to different individual claims, the record time between new moon and its sighting varies for naked eye, and aided eye (binocular or telescope). Dr. Doggett of U.S. Naval Observatory, Dr. Schaefer of Yale University, and Dr. Ahmad, a Professional astronomer have written a research paper on a collection of most early sighting claims, Q.J.R. Astr. Soc. (1993) 34, p53-56, “Records for young Moon Sightings.” For naked eye, claims are with the age 0 to 15.4 hours, but all claims less than 15 hours are not considered credible by professional experts in this field for various reasons. Some were reported a few days or weeks later, some few month later and in some cases, it was found that skies were overcast in that area, so claims were made for wrong dates. For aided eye, claims less than 13.47 hours are not considered credible. However, one point must be understood, and that is, even if a moon was sighted at the age
