Equinox 2025 Calendar. Solar calendar 2025 in norway showing 365/366 days with sunrise and sunset times and daylight length information. Autumn 2025 starts on monday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the changing tilt of the earth's axis.

The spring equinox, known as the vernal equinox in the northern hemisphere, is a day on which the sun sits directly over the equator, so day and night all over the world are of equal length. The september equinox is a seasonal milestone in earth’s yearly orbit around the sun.