21 or 22 December, the winter solstice
Winter solstice twenty-first or twenty-second of December!
The day when the sun rises to a minimum height above the horizon is called the winter solstice (as opposed to the summer solstice with the maximum position of the sun). From 365 the longest night falls usually on the twenty-first of December, but before the leap year this astronomical phenomenon is observed a day later – the twenty-second of December.
The winter solstice is an astronomical phenomenon that occurs when the inclination of The earth's axis of rotation in the direction from the Sun takes the greatest value. The maximum angle of inclination of the earth's axis relative to the Sun during the solstice is 23°. It is more obvious to residents of high latitudes that the winter solstice falls on the shortest day and the longest night of the year, when the height of the sun rise in the sky is the lowest.
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