The winter solstice is an astronomical event that occurs annually around December 21st or 22nd in the northern hemisphere and around June 20th or 21st in the southern hemisphere. It marks the shortest day and longest night of the year.
It occurs when the Earth's axial tilt is farthest away from the sun. In the northern hemisphere, the North Pole is tilted directly away from the sun, resulting in the lowest position of the sun in the sky and shorter daylight hours. Conversely, in the southern hemisphere, the South Pole is tilted directly towards the sun, leading to longer days and shorter nights.
During the winter solstice, the sun reaches its lowest point in the sky at noon, and the length of daylight is at its minimum. This phenomenon occurs because of the Earth's axial tilt, which causes variations in the amount of sunlight received by each hemisphere throughout the year.