Is the moon round or curved in winter?

It is curved, and the moon itself does not shine, but only reflects part of the sunlight that shines on it. In this way, for observers on the earth, with the change of the relative positions of the sun, the moon and the earth, the moon presents different shapes on different dates, which is the periodic change of the moon phase. Furthermore, although the moon is illuminated by the sun, there is always half a sphere that is bright.

However, because the moon keeps rotating around the earth and changes its position from time to time, the hemisphere facing the earth and the hemisphere irradiated by the sun sometimes overlap completely, sometimes a small part of it overlaps, and sometimes most of it overlaps, so the moon shows cloudy and sunny changes.

Extended data

There is a saying in the first half: the winter solstice is at the beginning of the month, and it is very cold; The winter solstice is in the middle of the month, cold and frost-free. The winter solstice solar term is the earliest solar term in China, and it is basically unchanged in the Gregorian calendar, ranging from 65438+February 2 1-23 every year.

When the sun shines directly on the tropic of Capricorn, the winter solstice solar terms are ushered in. On this day, the day is the shortest and the night is the longest in the northern hemisphere. Therefore, there is a saying, "Eating noodles on the solstice in winter makes the day longer." Statement.