Thread: Spring Equinox
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Old March 18th 16, 04:14 AM posted to uk.sci.weather
Tudor Hughes Tudor Hughes is offline
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Default Spring Equinox
On Friday, 18 March 2016 00:40:43 UTC, jumper wrote:
Why is the spring equinox on the 20th March, when at my location today
we had 12 hrs daylight / nighttime? On the 20th March we have 12hrs 12
mins daylight.

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Refraction. When the sun appears to be on the horizon it's geometrically below it by just over half a degree because the rays are bent downwards due to the higher density of the atmosphere at lower levels.

Tudor Hughes.
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