December 21: historical facts and curiosities

Today marks the December Solstice. Caused by Earth's axial tilt, this astronomical event brings the Winter Solstice to the Northern Hemisphere, with the year's shortest day and longest night, marking winter. Simultaneously, the Southern Hemisphere experiences its Summer Solstice, with its longest day and summer's start. This annual phenomenon influences global daylight and seasons.

On December 21st, the Northern Hemisphere experiences the Winter Solstice, marking the shortest day and longest night of the year. Conversely, the Southern Hemisphere celebrates its Summer Solstice, enjoying its longest day and shortest night. This astronomical event occurs when one of Earth's poles has its maximum tilt away from or towards the Sun, depending on the hemisphere. It signifies the official start of winter in the north and summer in the south.