In the course of a year there will always be an uneven distribution of light and dark on each side of the equator.
It is therefore, we experience summer and winter.
But twice a year, in march and in september, facing the Sun directly at the Earth’s equator, and so is night and day astronomical terms, of approximately equal length everywhere on Earth.
This moment, the u.s. National Oceanic and Atmospheric Administration (NOAA) caught on an exceptional satellite image taken by NOAA’s Geostationary Operational Enviromental Satellite.
It writes Science.dk.
The almost equal distribution of day and night is due to refraction of sunlight or lysbøjningen, which makes it look as if the Sun is above the horizon, although the Sun’s actual position is below the horizon, writes the National Weather Service, which is the u.s. response to the DMI.
the Phenomenon is known as the equinoxes, and in fact, we have just experienced forårsvarianten, the so-called vernal equinox, 20. march of this year. Science.dk has previously written an article that goes all the way to the bottom of the phenomenon.
Exactly 20. march at 22:28 local time the Sun was directly on the Earth’s equator, which marks the first astronomical day of spring. This day should also not be confused with the meteorological spring, which began 1. march.
the Image above was taken 20. march at 12:00 Danish time, where night and day were completely evenly distributed.
Forårsjævndøgnet is a positive day for us, who find ourselves north of the equator. It means that, the days started to become longer and, therefore, we can look forward to several hours in the company of the Sun in the next time.
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