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March 21 and September 23 are the approximate dates of the vernal and autumnal equinoxes which are considered to be the beginnings respectively of the astronomical spring and autumn seasons. The astronomical seasons are heavily promoted by the mass media, but are no more "official" than any other method of reckoning seasonal change. The World Meteorological Organization designates March 1 and September 1 respectively as the first days of the climatological spring and autumn seasons. Ecologically, spring begins locally with the start of the growing season which in temperate climates can be as early as February or as late as May depending on latitude and topography. The ecological autumn season begins locally when the leaves of deciduous trees turn colour and fall to the ground.

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Q: What is March 21 and September 21 called?
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Related questions

What months do the sun strike the equator directly?

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.


What is the name given to March 21 and September 21?

equinox


March 21 and September 21?

I don't know what that means!


What are Italy's season's?

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


What months does equinox occur?

Equinoxes occur twice a year - around 21 March, and around 23 September.


What are March 21 and September 21?

The vernal and autumnal equinoxes, respectively.


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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.


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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


What are the months of each season?

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


Which date in year does the day and night equal?

When the day and night are equal it is called the equinox (means literately equal night). It happens twice a year. Once in the sping called the vernal equinox which occurs on the March,20 or 21 each year. Once in the autumn or fall called the autumnal equinox which happens September, 21 - 22each year.


What kind of seasons does Chile have located in the southern hemisphere?

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


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From September 21 until March 21.