The vernal (spring) equinox is the moment when the sun crosses the celestial equator. On this day, day and night are nearly equal in length (about 12 hours each).
In the Northern Hemisphere, spring is defined by the vernal equinox. This occurs when the sun crosses the celestial equator, moving from south to north. During this specific moment, day and night are approximately equal in length. Typically March 20 or 21. End Date: The summer solstice, around June 21. spring definition season
While the equinox is poetic, it is not very practical for record-keeping. The varying length of astronomical seasons (ranging from 89 to 93 days) makes it difficult to compare climate data from year to year. Enter the meteorologists. The vernal (spring) equinox is the moment when
Scientifically, spring begins at the —typically March 19–21 in the Northern Hemisphere (September in the Southern Hemisphere). On this day, the Earth's axis is tilted neither toward nor away from the sun, giving us nearly equal hours of day and night (12 hours each). The word vernal comes from the Latin for "spring," and equinox means "equal night." This occurs when the sun crosses the celestial
– Cold air masses retreat as the sun’s angle increases. Soil and water warm, reducing frost frequency. “Spring thaw” refers to melting snow and ice.