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When does an equinox occur?

Answer 1

Hazel Asher

See explanation.

Equinox is either of the two instants of time at which it is no-shadow-

noon, at a location on the equator of the Earth.

It occurs on about March 21 or about September 23, every year.

March equinox is called vernal equinox and September equinox is

autumnal.

In 2017, these instants, in GMT, are nearly

Mar 20, 20:26 and Sep 22, 20:02.

A MON AVIS : The difference for half a year appears to be more

than the axial-precession-delay of

#1/2((24xx3600)/25800)=1.7 sec#, nearly.

https://tutor.hix.ai

These equinox locations are in the Pacific ocean.

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Answer 2

Hunter Arthur

Every two years, on or around March 20 and September 22, the Earth's equator passes through the center of the Sun, creating an equinox, which causes nearly equal amounts of day and night to last throughout the planet.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.