In the Southern Hemisphere, that day is the summer solstice and the longest day of the year.
The 23.5-degree tilt in the Earth’s axis of rotation causes the sun’s rise and fall over the course of a year. During the winter solstice, the Northern Hemisphere is tilted at its furthest distance from the sun, bringing in less light and cooler temperatures.
The tilt of the Earth – not our distance from the sun – is what causes winter and summer. In fact, the Earth is closer to the sun in the winter than it is in the summer months.
For those of you who don’t like the frost on your nose, tick your calendar: The first day of spring, also known as the vernal equinox, occurs on Sunday, March 20, at 11:33 a.m. ET/8:33 a.m. PT.
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https://abc13.com/winter-2021-solstice-first-day-of-december-21/11356723/ When is winter? The summer solstice of 2021 falls on December 21, marking the shortest day of the year