Autumnal equinox arrives in northern hemisphere this week

Summarised from 2 outlets · Updated 22 Sept, 14:52

The autumnal equinox occurs at 01.05 BST on 23 September, marking the astronomical beginning of autumn in the northern hemisphere.

The September equinox takes place this week, marking the start of astronomical autumn in the northern hemisphere and spring in the southern hemisphere. The precise moment occurs at 01.05 BST on 23 September. Although commonly said to be when day and night are equal, they will not actually be equal until Friday.

How it is being reported

• Autumn equinox 2026: When is it and what happens?BBC News · 22 Sept, 01:05
• Starwatch: Autumnal equinox in northern hemisphere, spring in the southThe Guardian · 21 Sept, 06:00

In this story: northern hemisphere · southern hemisphere · UK

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