Science
Starwatch: equinox, when the sun sits on the equator – The Guardian
Tomorrow marks the changing of the seasons as the sun crosses the equator to bring summer to the southern hemisphere and winter to the north
Summer officially ends in the northern hemisphere tomorrow, and we enter the autumn. This is the time of year when the length of day and night are exactly equal. Known as the September equinox, it always takes place sometime around the 21st of the month. This year, it takes place on 22 September at 1431 BST.
At this moment the sun will be located directly on the celestial equator, the projection of Earths equator into the sky. This means the sun will pretty much rise due east and set due west o…
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