Solstice 2025 Australia Time. Sydney the exact moment of the summer solstice in 2025 is 20 march, at. Sun appears stationary at its southernmost declination (approx.
Whilst this delivers the longest day of the year the actual length of this day will vary according to location. In different time zones, the date of the solstice can differ by a day, so it is important to indicate your exact location.