Question

hello friends koi batayega ye chandra girahan kya hota h

Answer 1

It is lunar eclipse........
A lunar eclipse occurs when the Moon passes directly behind Earth and into its shadow.[1]This can occur only when the Sun, Earth, and the Moon are aligned (in syzygy) exactly or very closely so, with the planet in between. Hence, a lunar eclipse can occur only on the night of a full moon. The type and length of an eclipse depend on the Moon's proximity to either node of its orbit........

Answer 2

An eclipse in which the moon appears darkened as it passes into the earth's shadow.
Hope it helps