Umm Al-Qura Calendar

Umm al-Qura calendar is a lunar calendar based on the moon's cycle to determine the months, as well as part of the solar calendar to determine the seasons and Islamic times, and it is the official calendar of the Kingdom of Saudi Arabia used for official and popular dating. The coordinates (longitude and latitude) of the Holy Kaaba in Mecca are primarily used for the Umm al-Qura calendar, and it depends on the astronomical birth of the crescent moon at sunset after sunset in Mecca.