Fall Equinox 2018


When is the Fall Equinox 2018?

The Fall Equinox 2018 is on Sunday, September 23, 2018 (in 304 days).  2018 Calendar
The Fall Equinox 2017 has already passed: it was on Friday, September 22, 2017 (61 days ago).  2017 Calendar

What is the Fall Equinox?

The fall equinox marks the beginning of fall. Photo: flickr.com/photos/16516058@N03/8128117868The fall equinox marks the beginning of fall
Fall equinox is another name for the equinox also known as autumnal equinox and September equinox. An equinox is the moment in time (not a day-long event) when the Sun stands directly above the equator and day and night are of approximately equal length. For the Northern Hemisphere, the fall equinox is the moment when summer ends and fall (autumn) begins, while for the Southern Hemisphere it is the moment when winter ends and spring begins.

In the Northern Hemisphere the fall equinox 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 fall 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 fall equinox 2018 in your area use this seasons calculator.

The fall 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 spring 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 fall 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 fall 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 fall 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 fall 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 fall equinox moves forward in time compared to the same moment in the year before.


For more information see Equinox on Wikipedia.

When is the Fall Equinox 2019?

The Fall Equinox 2019 is on Monday, September 23, 2019 (in 669 days).  2019 Calendar

Dates for the Fall Equinox from 2010 to 2025

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

When is ...? Date      Day of the week      Days away     
Fall Equinox 2010      September 23, 2010      Thursday      2617 days ago
Fall Equinox 2011      September 23, 2011      Friday      2252 days ago
Fall Equinox 2012      September 22, 2012      Saturday      1887 days ago
Fall Equinox 2013      September 22, 2013      Sunday      1522 days ago
Fall Equinox 2014      September 23, 2014      Tuesday      1156 days ago
Fall Equinox 2015      September 23, 2015      Wednesday      791 days ago
Fall Equinox 2016      September 22, 2016      Thursday      426 days ago
Fall Equinox 2017      September 22, 2017      Friday      61 days ago
Fall Equinox 2018      September 23, 2018      Sunday      in 304 days
Fall Equinox 2019      September 23, 2019      Monday      in 669 days
Fall Equinox 2020      September 22, 2020      Tuesday      in 1034 days
Fall Equinox 2021      September 22, 2021      Wednesday      in 1399 days
Fall Equinox 2022      September 23, 2022      Friday      in 1765 days
Fall Equinox 2023      September 23, 2023      Saturday      in 2130 days
Fall Equinox 2024      September 22, 2024      Sunday      in 2495 days
Fall Equinox 2025      September 22, 2025      Monday      in 2860 days
Data provided 'as is' without warranty

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




Printable 2018 Calendars


Calendar templates 2018 for Word, Excel & PDF
Calendar templates 2018 for Word, Excel & PDF

2018 calendar as templates for
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A selection of calendar templates for 2018 in landscape and portrait orientation and with US federal holidays, suitable for a variety of applications.

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Vernal equinox (spring equinox,
March Equinox)
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September equinox)
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