News & Press: Natural world

Autumnal Equinox

21 September 2020   (0 Comments)
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Astronomically, we say ‘farewell’ to Summer at the Autumnal Equinox, when the Sun passes over the equator - at 1330 UTC (1430 BST) on 22 September.



Autumn will now run until the Winter Solstice - on 21 December. Then Winter will last until the Vernal Equinox, when the Sun passes back into the northern hemisphere - on 20 March 2021.

But in meteorological terms, Autumn is considered to be the months of September, October and November, with the other seasons following in 3-month periods.

And British Summer Time (BST) will cease at 0200 BST on 25 October, in compliance with an EU directive since 2002, which states that ‘Summer Time’ will be observed between the last Sundays in March and October, clocks to change at 0100 UTC.

Further details from the Royal Observatory