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Today is the longest night of the year
The longest night is due to the southward movement of the sun.

December 21 is recognized as the shortest day and longest night of the year in the Northern Hemisphere. Today is Saturday (December 21) — that night.
Tomorrow Sunday (December 22) is also the shortest day of the year in this half of the world. The exact opposite picture, however, will prevail in the Southern Hemisphere. 4 such dates of the year occur in the context of sunlight falling on either side of the equator. As ‘day-night’, 2 of them are equal in date and 2 are smallest-greatest in time range.
The longest night is due to the southward movement of the sun. So even though evening falls quickly in the Northern Hemisphere today, it will take the longest time of the year to end the night.
According to the rules of the solar system, from December the southern hemisphere of the earth leans towards the sun, the northern hemisphere goes far away. At this time, the sunlight falls weakly in the north, so it is winter there and summer in the south.
The Northern Hemisphere is farthest from the Sun on December 21. As a result, there is very little sunlight, so the days end quickly and the nights are long. This is called the ‘Winter Solstice’ or the southing of the sun. During this…