Question

What do you understand by equinox?

Answer 1

On 21 March and 23 September, The sun shines vertically on the equator.
* At this position neither of the hemispheres is tilted towards the Sun, so the whole of the Earth experiences equal days and equal nights.
* It is neither very cold nor very hot all over the world.
* The northern Hemisphere experiences spring on 21st March and autumn on 23rd September.
* Exactly the opposite happens in the Southern Hemisphere. Here, it is spring on September 23rd and autumn on March 21st.
* These positions are called Spring and Autumn Equinoxes respectively.