Happy first day of Spring! Today is the Spring Equinox, the first day of Spring in the Northern Hemisphere. The March equinox – also called the vernal equinox – is the astronomical beginning of the spring season in the Northern Hemisphere. On the equinox, the Northern and Southern Hemispheres will experience roughly equal amounts of sunlight. An equinox occurs twice every year, in March and September. On the day of an equinox, observers at the equator will see the Sun directly overhead at noon.

When is the first day of spring this year? Here's what to know about the vernal equinox.

What to know about the first day of spring

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