Coinciding with the vernal equinox, which usually falls on March 20, the length of day and night is approximately equal around the world during the autumnal equinox. The sun then rises vertically over the equator, giving about 12 hours of night and 12 hours of day, worldwide.
So the differences in these refractions of light in the atmosphere occur twice a year, you can continue reading SNL.no.
And then, it happens relatively quickly here in the Northern Hemisphere. The days are getting shorter and temperatures are dropping because the sun is lower in the sky and has fewer hours for warmth.
And so it will be until the winter solstice on December 22 at 04:27, when we say the sun “rotates.”
The days are getting shorter
So summer has officially ended, the winter half-year has been declared astronomically, and the days are now getting shorter and shorter.
In addition to the sun rising later in the evening, it also rises later in the morning. This means that the length of the day decreases by more than 6 minutes on average per day.
For example: On September 22 in Oslo, the sun shines for 12 hours and 17 minutes. A month later, on October 22, the period reaches nine hours and 37 minutes.
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The sun sets once a year in the Arctic
At the Arctic Circle, you get 15 minutes less daylight per day, while at the equator you only get a 4-second difference.
In the Arctic there is a sunset only once a year, at the time of the autumn equinox. After sunset, it gets dark until the sun rises again at the vernal equinox, and it’s sunny day and night, the midnight sun, until the next sunset.
In Antarctica, the opposite happens: the Sun appears at this time, and will be visible above the horizon for half a year until the vernal equinox.
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It happens at different times each year
Since the calendar year is not as long as the so-called tropical year, which is the time it takes the Earth to make a complete revolution around the sun, the autumnal equinox does not always fall on the same day.
This time difference is compensated for by establishing a leap year every four years.
| Spring equinox | Summer Solstice | autumnal equinox | Winter solstice |
| 20.03.23 at 22:24 | 06/21/23 at 16:57 | 09/23/23 at 08:50 | 22.12.23 at 04:27 |
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