ELI5: How KSA sights the crescent moon first?

r/

I wanna know its scientific and astronomical reason. Indonesia and Malaysia are in east but sometimes they also celebrate Eid on the same day of KSA.

Comments

  1. Antithesys Avatar

    There isn’t a scientific or astronomical reason; the crescent moon can be “first” seen from any part of the world in which the moon is above the horizon. I’m not educated on this tradition but I would imagine the Saudis could potentially have certain reasons in starting Eid on or before a particular date, whatever they might be.