The word “Qamar,” referred to as a heavenly body in the Qur’an and meaning “Moon” appears 27 times. The elliptical orbit of the Moon around the Earth also takes 27 days. But this is not a number that someone looking from Earth could determine. Because since there is a 29-day between full moons, it used to be thought it took the Moon 29 days to travel around the Earth. Read more
