what is the Chandra Grahan & how it occurs it

Chandra Grahan (Lunar Eclipse) is a stage of Moons cycle, where the Earth comes between the Moon and the Sun. Lunar eclipse occurs at a moment

when the Moon, Earth are absolutely aligned, or reach nearer, with the Earth in the middle of the three. Then the Moon comes across through some

part of the Earths shadow and darkens the planet Moon. Usually, Lunar eclipse occurs on the Full Moon Day (Purnima).