Tonight marks the official beginning of spring in the United States. It's the first time since 1896 that the first day of spring has occurred on March 19 nationwide, irrespective of time zone.
The word"spring" refers to: the weather that happens between winter and summer, which is meteorological spring; and one portion of the Earth's oval-shaped journey around the Sun, which is astronomical spring.
On the equinox, day and night are roughly equal everywhere on Earth. The date varies because the 365-day calendar doesn't perfectly line up with the motion of the Earth around the Sun.Encyclopaedia Britannica/Universal Images Group via GettyAstronomical spring begins in the northern hemisphere at the moment around this time of year when the Earth's axis is tilted neither toward nor away from the Sun.
Most years, we drop that extra 0.24 and pretend that the year is simply 365 days long. But the Earth's location in its solar orbit doesn't change just because we rounded, so the time at which we experience the equinox gets about a quarter of a day later each year. For example, the time of the equinox would move from around 3 a.m. to 9 a.m. to 3 p.m. over the course of three years.
All those little rounding errors add up over time. If we blithely added a leap day every four years forever, our whole calendar would eventually be totally out of whack with the actual orbit of the Earth.
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