Meteorologists consider March 1 the start of spring. An equinox occurs twice a year. The autumnal equinox occurs in September – when the Earth's axis is tilted neither toward nor away from the ...

Today marks the first day of spring 2025. The vernal equinox marks the start of spring every March. The autumnal equinox marks the start of fall every September. An equinox occurs, "two times of ...

The date and time of the equinox varies slightly from year to year. The Earth is not tilted toward or away from the sun on the first day of fall as well, also called the autumnal equinox.