The vernal equinox, which marks the start of spring in the northern hemisphere, starts Monday at 2:24 p.m. PDT.
On the day, an animation based on satellite images was released by the National Oceanic and Atmospheric Administration, showing the shifting angle of the sun over the past 12 months, from the last spring equinox to the brink of this year’s. The shift is due to the Earth’s tilt.
The video was made by collecting one image per day over the last year from the GOES East satellite, taken at the exact same time each day. The result shows how the seasons change from equinox to solstice and back.
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