The Winter Solstice marks the official beginning of astronomical winter. We may think of the Winter Solstice as a full day, but in fact, it happens for just a instant, when our Sun reaches the farthest South that it can in a year, over the Tropic of Capricorn. This year, that time is 5:48pm AT.
From that moment on, the Sun begins its long journey back to our Hemisphere, and signals the coming end of summer in the Southern Hemisphere.
This is all thanks to Earth’s tilted axis, which makes it so that one half of Earth is pointed away from the Sun and the other half is pointed towards it at the time of the solstice.
"Dong Zhi" in China, "St Lucia's Day" in Scandinavia, "Saturnalia" in ancient Rome...the Winter Solstice holds significance across a variety of cultures, as it signals the changing of the seasons.
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