Spring Equinox – Vernal Equinox. The Vernal (Spring) Equinox in the Northern Hemisphere is the Autumnal (Fall) Equinox in the Southern Hemisphere and vice versa.
The year's third and final supermoon will happen during the spring equinox. On March 20, the Full Worm Supermoon will mark the first time a full moon and the spring equinox have coincided this closely in 19 years, according to the Farmer's Almanac.