4.On which of the following dates Autumnal Equinox occurs? [A] March 21 [B] June 21 [C] September 23 [D] March 21 Show Answer
In the northern hemisphere, the autumnal equinox occurs on September 22nd or 23rd, when the sun crosses the celestial equator heading south. In the Southern Hemisphere, the equinox occurs on his March 20th or 21st when the Sun moves north across the celestial equator.
