Today marks the Autumn Equinox in the northern hemisphere -nature's first day of autumn. Ironically today will feel more like late summer than early autumn for some of us with warm sunshine and highs of 23c.
It's today that the sun positions itself to pass directly above the equator and day and night become nearly equal in length.
At the South Pole, penguins will see the sun for the first time in six months - while at the North Pole, polar bears are about to have six months of darkness.
We get our lighter evenings for a few weeks yet though - the clocks don't go back until the end of October.