when does the spring equinox occur
The Spring Equinox. The Spring Equinox is the first day of spring season and occurs when the sun passes the equator moving from the southern to the northern hemisphere. The North Pole begins to lean toward the sun again.Day and night have approximately the same length.Spring Equinox is near 20 March.he Autumn Equinox is the first day of the autumn season and occurs when the sun passes the equator moving from the northern to the southern hemisphere. The North Pole begins to tilt away from the sun. Day and night have approximately the same length. Autumnal equinox is near 22 September.