March 21 and September 23 There are 2 days known as equinoxes. March 22 and September 22. Equinox. There is a spring equinox and an autumn equinox. Equinox Occurs Twice Yearly. The days vary. It...
The same reason we have seasons. It is this same rotation that causes daylight to occur for shorter periods of time during the winter (longer daylight hours during summer months) the further from the...