“As it orbits the Sun, the Sun illuminates the northern or southern hemisphere more depending on where the Earth is along its orbit,” the museum states.
“However, at two points in the year the Sun will illuminate the northern and southern hemispheres equally. These are known as the equinoxes.”
This also means that in the northern hemisphere when autumn officially begins, at the same time spring is commencing in the southern hemisphere.
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Encyclopædia Britannica adds that the autumn equinox in the northern hemisphere marks just one of two times of the year when “the Sun is exactly above the Equator and day and night are of equal length”.
The autumn season lasts until winter, which begins this year on 21 December according to the astronomical season, the Met Office states.
When is the spring equinox?
The spring equinox in the northern hemisphere is the second of the two times of the year when day and night are of equal length.
The 2021 spring equinox, marking the official start of spring, will take place on Saturday 20 March.
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