They're widely and erroneously known as the equinoxes, but they're not.
The equinoxes are points on the map of the sky, not points in time.
March 21 and September 21 are the dates near which the sun reaches
and passes the equinoxes.
day light savings
Days between 14 March and 21 April 2010 are 38.
From September 21 until March 21, the shortest shadow points north from the equator. From March 21 until September 21, the shortest shadow points south from the equator.
21 of them.
21
That happens at some point on the equator, at a single moment, on two days of the year ... near March 21 and near September 21.
Adding 186 days to March 21 of any year gives September 23 of the same year.
North pole have no sunshine at all from September 21 until March 21. South pole have no sunshine at all from March 21 until September 21.
The spring equinox is March 21, The fall equinox is September 23
Only on the 2 equinox's which are March 21 and September 21.
Equinox is correct
That happens at some point on the equator, at a single moment, on two days of the year ... near March 21 and near September 21.
The two days are known as the Equinox. The spring Equinox (typically June 21) is known as the "Vernal Equinox". The fall Equinox (Typically September 21) is known as the "Autumnal Equinox".
I don't know what that means!
equinox
day light savings
We got four seasons not just two: winter is from 21 November to 21 march spring is from 21 march to 21 June summer is from 21 June to 21 September autumn is from 21 September to 21 November