Question

On 21 march days and nights are of equal duration at all places on the earth

Answer 1

September 23 will have equal day and night. The sun will on Thursday cross the plane of the earth's equator makingday and night of approximately equalduration. The event known as equinox is eagerly awaited by space enthusiasts as it takes place twice a year on March 21 and September 23. ... It means equal day and night.