Spring Equinox 2025 Northern Hemisphere. 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. At this solstice, the northern hemisphere is most tilted toward the sun, by the maximum angle of 23.5 degrees.
The spring equinox, also known as the vernal equinox or march equinox, marks the beginning of spring in the northern hemisphere. Spring 2025 starts on thursday, march 20th in the northern hemisphere, with daylight time lengthening and the leaves begining show on the trees with the changing tilt of.