On an equinox, day and night are of approximately equal duration all over the planet – a day and night of roughly 12 hours each.
— Met Office (@metoffice) September 22, 2017
There are two equinox’s every year around 20 March and 22 September.
Today’s equinox marks the start of Autumn after which nights start to get longer than days, until the spring equinox next year.
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