Winter 2023-24 starts 10:27 p.m. EST , Dec. 21, which is right now if our internet service provider’s clock is accurate.
This means that tilt of Earth’s semi-axis is most inclined to the sun in the Southern Hemisphere which is a solstice.
The axis will in a few moments slowly start reversing itself until it is the Northern Hemisphere that is most inclined to the sun.
This would be the start of our summer (and Argentina’s winter).
Today is the shortest day of the year.