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.
Equinoxes occur twice a year - around 21 March, and around 23 September.
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.
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
* 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
This is only the number of days but does not account for holidays. January 23 February 21 March 21 April 22 May 22 June 21 July 23 August 21 September 22 October 23 November 20 December 23
When you live near the equator, or at the equinoxes (March 20 or 21, September 22 or 23).
12 hour days and 12 hour nights, thus equal day and night (equinox). Happens twice a year, around March 21 and September 23, when winter and summer are considered "over".
Aries (21 March-20 April) Taurus (21 April-21 May) Gemini (22 May-21 June) Cancer (22 June-22 July) Leo (23 July-22 August) Virgo (23 August-21 September) Libra (22 September-22 October) Scorpio (23 October-21 November) Sagittarius (22 November-21 December) Capricorn (22 December-20 January) Aquarius (21 January-19 February) Pisces (20 February-20 March) Pisces