Winter Solstice 2025 Australia Time. The winter solstice, or december solstice, occurs around december 21 or 22 in the northern hemisphere. Winter solstice 2025 (beginning of astronomical winter) on the day of the winter (december) solstice, the sun passes through the southernmost point of the ecliptic, that is, as far as possible from the celestial equator to the south (for the northern hemisphere of the earth).
The summer solstice is also known as the longest day, which is perhaps the most notable feature. You can also explore the time and date for astronomical seasons summer & winter, solstice spring & autumns.