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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.
There are two different types of equinoxes; the Vernal Equinox which happens on March 21 or 22. There is also a Autumnal Equinox which happens on September 21, 22 or 23.
Equinoxes occur twice a year - around 21 March, and around 23 September.
September 23 and March 21 the poles are equally distant from the sun.
The spring equinox is March 21, The fall equinox is September 23
Adding 186 days to March 21 of any year gives September 23 of the same year.
Equinox. It happens every March 21-22 and September 22-23. ~Earth Science Ninth Edition 2000
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.
the vernal is in the spring march 21 and the autumnal is September 23
* Aries - March 21 - April 20 * Taurus - April 21 - May 21 * Gemini - May 22 - June 21 * Cancer - June 22 - July 22 * Leo - July 23 -August 21 * Virgo - August 22 - September 23 * Libra - September 24 - October 23 * Scorpio - October 24 - November 22 * Sagittarius - November 23 - December 22 * Capricorn - December 23 - January 20 * Aquarius - January 21 - February 19 * Pisces - February 20- March 20
Aries 21 March - 20 April Taurus 21 April - 21 May Gemini 22 May - 21 June Cancer 22 June - 23 July Leo 24 July - 23 August Virgo 24 August - 23 September Libra 24 September - 23 October Scorpio 24 October - 22 November Sagittarius 23 November - 21 December Capricorn 22 December - 20 January Aquarius 21 January - 19 February Pisces 20 February - 20 March
That happens twice a year, at the time of the 'equinoxes'. It's one moment on or aboutMarch 21, and another one on or about September 21.No definite date can be given, because the calendar is not exactly synchronized to the sunso the date 'wanders' slightly, and also because at the moment when it happens, it's noteven the same date everywhere in the world.