Winter Solstice 2024 Australia. The winter solstice marks the official start of the astronomical winter, as the sun reaches its most southerly point in the sky as seen from earth. This year’s winter solstice occurs on saturday, december 21, 2024, at 4:20 am est (09:20 utc).for a full calendar, please visit time and date.

The date of the summer solstice marks the longest day of the year, although this varies from state to state. Times apply to june 21, 2024.