Tropical solstice shadows

Solstices mark the changing of seasons, occur twice a year, and feature the year's shortest and longest daylight hours—depending on your hemisphere. These extremes in the length of day and night make solstice days more ...

Spring is here: NOAA satellite animation captures vernal equinox

Spring has officially arrived in the Northern Hemisphere, while the Southern Hemisphere is embracing autumn. The start of astronomical spring, known as the vernal equinox, occurred yesterday, March 19, 2024, at 11:06 p.m. ...

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