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This year, the vernal equinox occurs on March 19, 2020. The last time it occurred this early was in 1896.

There are only two times of the year when the Earth's axis is tilted neither toward nor away from the sun, resulting in…

Spring has officially sprung here in the Northern Hemisphere—while in the Southern Hemisphere, autumn has begun!

It is that time of year again (it happens twice) when the relative angle of Earth is perpendicular to the Sun, causing equal…

In 2019, the official start of fall—the Autumnal Equinox—was Monday, Sept. 23 at 3:50 a.m. EDT.

There are two times each year, in March and September, when the amount of daylight and darkness is “nearly” equal at all…

It’s officially autumn in the Northern Hemisphere—the season when days get shorter as that half of the world heads toward…

Spring has officially arrived in the Northern Hemisphere, while the Southern Hemisphere is embracing autumn.