Autumn is rapidly approaching. The Autumn equinox falls on 23 September, when night and day are pretty much exactly the same length – 12 hours – all over the world; equinox means "equal night ...

As the Northern Hemisphere welcomes spring today, the Southern Hemisphere greets the first day of autumn. The word equinox is derived from the Latin words "aequus" (equal) and "nox" (night).