Precise moment of equinox in UK is 1. 05am on Wednesday – but day and night will not be equal until Friday The September or autumnal equinox takes place this week. It marks the astronomical beginning of autumn in the northern hemisphere and spring in the southern hemisphere.

Source: [Guardian International](https://www.theguardian.com/science/2026/sep/21/starwatch-autumnal-equinox-northern-hemisphere-spring-south)

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