September equinox 2020

When is the September equinox 2020?

What is the September equinox?

The September equinox, also called southward equinox, is the moment in time (not a day-long event) when the Sun stands directly above the equator while crossing from the north to the south. For the Northern Hemisphere (where nearly 90% of the world's population live) it is the autumnal equinox (fall equinox) as it is the moment when summer ends and autumn (fall) begins, while for the Southern Hemisphere it is the vernal equinox (spring equinox), the moment when winter ends and spring begins. Up until the September equinox the Sun rises and sets more to the north of the equator, and afterwards it rises and sets more to the south.

The September equinox usually occurs every year on September 21 to 23. Very occasionally it can also fall on September 21 or 24. The dates given on this page are based on Coordinated Universal Time (UTC), which for practical purposes is equivalent to Greenwich Mean Time (GMT). While the September equinox occurs at the same moment in time all over the world, the date and local time differ from place to place depending on the year and a location's time zone. For locations that are ahead of UTC (further east) it may fall on the day after, and for locations that are behind UTC (further west) it may fall on the day before. To find out the exact date and time of the September equinox 2020 in your area use this seasons calculator.

The September equinox is one of four days (two equinoxes and two solstices) throughout the year that mark the beginning of a new season. The other days are the March equinox, the June solstice and the December solstice.

The word "equinox" is derived from Latin and means "equal night". On the day of an equinox, day and night are of approximately equal length all over the world, as the Earth's rotational axis is neither tilted away from nor towards the Sun. At all other times the length of day and night will be different.


The exact moment of the September equinox through the centuries

Graph demonstrating the movement (caused by leap shifting) of the exact moment of the September equinox between 1900 and 2520. X axis (bottom, horizontal): Calendar years, Y axis (left, vertical): day in September (21 to 23).

In a non-leap year, the moment of the September equinox is about 5 hours 49 minutes after that moment in the previous year (in UTC), and in a leap year it is about 18 hours 11 minutes before that moment in the previous year, as can be seen in this graph. In this way the time of the September equinox constantly shifts back and forth so it always stays around September 21 to 23. This four year cycle is clearly visible in the graph.

To adjust for the gradual movement backwards on the calendar (as visible for the period 1900 to 2099), in years divisible by 100 (1900, 2100, 2200, 2300 and 2500 on the graph), which should be leap years as they are divisible by 4, the leap day is omitted (except when they are divisible by 400, eg. 2000 and 2400) and the moment of the September equinox moves forward in time compared to the same moment in the year before.


For more information see September equinox on Wikipedia.

When is the September equinox 2021?

Dates for the September equinox from 2015 to 2025

The next occurrence of the September equinox is marked in red.

When is ...?	Date	Day of the week	Days away
September equinox 2015	September 23, 2015	Wednesday	1650 days ago
September equinox 2016	September 22, 2016	Thursday	1285 days ago
September equinox 2017	September 22, 2017	Friday	920 days ago
September equinox 2018	September 23, 2018	Sunday	554 days ago
September equinox 2019	September 23, 2019	Monday	189 days ago
September equinox 2020	September 22, 2020	Tuesday	in 176 days
September equinox 2021	September 22, 2021	Wednesday	in 541 days
September equinox 2022	September 23, 2022	Friday	in 907 days
September equinox 2023	September 23, 2023	Saturday	in 1272 days
September equinox 2024	September 22, 2024	Sunday	in 1637 days
September equinox 2025	September 22, 2025	Monday	in 2002 days
Data provided 'as is' without warranty

Dates of the September equinox 2020 and surrounding years as downloadable image file

Calendar templates 2020 for Word, Excel & PDF

2020 calendar as templates for Word, Excel & PDF A selection of calendar templates for 2020 in landscape and portrait orientation and with US federal holidays, suitable for a variety of applications. 2020 calendar templates for Word 2020 calendar templates for Excel 2020 calendar templates for PDF

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