Question

What is an equinox and what are there two types?

Answer 1

the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length (about 23 September and 21 March). There are two types of equinox- Autumnal equinox and vernal equinox. Autumnal Equinox comes on 23 September for northern hemisphere and vernal equinox comes on March 21 for northern hemisphere. Autumnal Equinox comes on 21 March for southern hemisphere and vernal equinox comes on September 23 for northern hemisphere.