The sun will today cross the plane of the earth’s equator making day and night of approximately equal duration.
The event known as equinox is eagerly awaited by space enthusiasts as it takes place twice a year on March 21 and September 23.
On the equinox day, the sun moves across the celestial equator which lies directly above the earth’s equator.
This year the phenomenon will take place at 08:39 am, SPACE President Chander Bhushan Devgun said.
The exact time of the equinoxes are not fixed but fall about six hours later every year, amounting to one full day in four years which in turn makes a leap year, Devgun said.
Science Popularisation Association of Communicators and Educators (SPACE), an NGO, and its members has planned a programme at Jantar Mantar tomorrow on the occasion.