The effect of the winter solstice on the Earth's rotation and revolution

The winter solstice is the day of the year when the sun is at its most southerly point, after which the point of direct sunlight begins to move northward from the Tropic of Capricorn, the length of day in the northern hemisphere begins to gradually increase, and the altitude of the sun at midday gradually rises.

It is worth noting that around the winter solstice, the Earth is located near perihelion and orbits at a slightly faster rate, which causes the sun to be in the southern hemisphere for about eight days shorter than in the northern hemisphere over the course of a year, making the northern hemisphere's winters slightly shorter than its summers.

Note: The Earth's polar axis passes through the center of the Earth, connecting the north and south poles, and makes an angle of 66°34′ with the Earth's rotational orbital plane, and is perpendicular to the Earth's rotational orbital plane, the equatorial plane.

After the winter solstice is a long day and a short night. Winter solstice day, the northern hemisphere, the height of the sun at noon is also the lowest, for example, in Beijing, the sun's height is only 26 ° 42 ′, because this day at noon the longest shadow of the table, so it is also known as "long solstice day".

Ancient China attached great importance to the winter solstice, the provisions of the winter solstice month for the "son of the month", is the first of the twelve branches of the earth's sequence. Therefore, the winter solstice is also a traditional festival, commonly known as the "Winter Festival" "long solstice festival" and so on.