Another seasonal signpost

Earth’s tilt on its axis causes the seasons. The tilt causes the Northern and Southern Hemispheres to trade places, in receiving the sun’s rays most directly.

Equinoxes and solstices, via Geosync

Equinoxes and solstices, via Geosync

In 2015, the vernal equinox arrives on March 20 at 22:45 UTC, or 5:45 p.m. Central Daylight Time. Happy spring or fall, everyone! This image captures the tilt of Earth with respect to the sun, as our world moves in its yearly orbit.

Everything you need to know: Vernal equinox 2015

How to translate UTC to your time zone

2015 equinox: Sun rises due east and sets due west

A Chinese perspective on the spring equinox

Deborah Byrd