Autumnal Equinox 2018


When is the Autumnal Equinox 2018?

The Autumnal Equinox 2018 is on Sunday, September 23, 2018 (in 364 days).  2018 Calendar
The Autumnal Equinox 2017 has already passed: it was on Friday, September 22, 2017 (2 days ago).  2017 Calendar

What is the Autumnal Equinox?

The autumnal equinox marks the beginning of autumn. Photo: flickr.com/photos/flatworldsedge/5140846204The autumnal equinox marks the beginning of autumn in the Northern Hemisphere
In the Northern Hemisphere, the moment in time when the Sun stands directly above the equator while crossing from the north to the south is called autumnal equinox (also known as fall equinox, September equinox or southward equinox). It is the moment summer ends and autumn (fall) begins in the Northern Hemisphere (where nearly 90% of the world's population live). For the Southern Hemisphere, it is the vernal equinox (also called spring equinox) as it is the moment winter ends and spring begins.

In the Northern Hemisphere the autumnal equinox occurs every year on September 21 to 23. 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 autumnal 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 autumnal equinox 2018 in your area use this seasons calculator.

The autumnal 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 vernal equinox (beginning of spring), the summer solstice (beginning of summer) and the winter solstice (beginning of winter).

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 autumnal equinox through the centuries
The exact moment of the autumnal equinox between 1900 and 2520. Originally by Frank Klemm, de.wikipedia.org/wiki/Datei:Herbstanfang.png, Creative Commons, CC-by-sa 3.0/de
Graph demonstrating the movement (caused by leap shifting) of the exact moment of the autumnal 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 autumnal 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 autumnal 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 autumnal 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 Autumnal Equinox 2019?

The Autumnal Equinox 2019 is on Monday, September 23, 2019 (in 729 days).  2019 Calendar

Dates for the Autumnal Equinox from 2010 to 2025

The next occurrence of the Autumnal Equinox is marked in red.

When is ...? Date      Day of the week      Days away     
Autumnal Equinox 2010      September 23, 2010      Thursday      2558 days ago
Autumnal Equinox 2011      September 23, 2011      Friday      2193 days ago
Autumnal Equinox 2012      September 22, 2012      Saturday      1828 days ago
Autumnal Equinox 2013      September 22, 2013      Sunday      1463 days ago
Autumnal Equinox 2014      September 23, 2014      Tuesday      1097 days ago
Autumnal Equinox 2015      September 23, 2015      Wednesday      732 days ago
Autumnal Equinox 2016      September 22, 2016      Thursday      367 days ago
Autumnal Equinox 2017      September 22, 2017      Friday      2 days ago
Autumnal Equinox 2018      September 23, 2018      Sunday      in 364 days
Autumnal Equinox 2019      September 23, 2019      Monday      in 729 days
Autumnal Equinox 2020      September 22, 2020      Tuesday      in 1094 days
Autumnal Equinox 2021      September 22, 2021      Wednesday      in 1459 days
Autumnal Equinox 2022      September 23, 2022      Friday      in 1825 days
Autumnal Equinox 2023      September 23, 2023      Saturday      in 2190 days
Autumnal Equinox 2024      September 22, 2024      Sunday      in 2555 days
Autumnal Equinox 2025      September 22, 2025      Monday      in 2920 days
Data provided 'as is' without warranty

Autumnal Equinox 2018 Dates of the Autumnal Equinox 2018 and surrounding years
as downloadable image file




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The seasons
Spring
Vernal equinox (spring equinox,
March Equinox)
Summer
Summer solstice (June solstice)
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Autumnal equinox (fall equinox,
September equinox)
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Winter solstice (December solstice)

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