What is the spring equinox?
Media playback is unsupported on your device

What is the spring equinox?

20 March 2017 Last updated at 12:54 GMT

Spring is officially here, with the March equinox!

Our daylight hours are getting longer, and for one day the length of daylight is practically the same as the length of night time.

But why does it happen? Weather presenter Simon King is on the case...