The vernal and autumnal equinoxes, respectively.
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 name given to March 21 and September 21 is the "equinox". This is when day and night are nearly equal in length, marking the beginning of spring (vernal equinox) on March 21 and the beginning of autumn (autumnal equinox) on September 21.
I don't know what that means!
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
Equinoxes occur twice a year - around 21 March, and around 23 September.
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.
In the southern hemisphere: Summer=December, January, February Autumn=March, April, May Winter=June, July, August Spring=September,October,November In the northern hemisphere: June 21 - September 21 is Summer September 21 - December 21 Autumn December 21 - March 21 Winter March 21 - June 21 Spring
In the Southern Hemisphere: Summer=December, January, February Autumn=March, April, May Winter=June, July, August Spring=September,October,November In the northern hemisphere: June 21 - September 21 is Summer September 21 - December 21 Autumn December 21 - March 21 Winter March 21 - June 21 Spring
Chile has the same seasons that the US has, but at different times.Spring . . . . . September 21 - December 21Summer . . . December 21 - March 21Autumn. . . . March 21 - June 21Winter. . . . . June 21 - September 21
March 21 and September 21.
From September 21 until March 21.
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.