It’s the start of Autumn in the northern hemisphere, Spring down south. In Catfood Earth:

In Catfood Earth for Android:

It’s the start of Spring today in the northern hemisphere, Autumn if you’re south of the equator:

Rendered in Catfood Earth.
Summer ends and autumn begins in the northern hemisphere. South of the equator it’s the start of spring. The picture of the equinox below was rendered in Catfood Earth.

The Autumnal Equinox for 2009 was at 21:18 GMT today. The image below captures the equinox in Catfood Desktate:

It's the start of Autumn/Fall in the northern hemisphere, Spring for the southern.
With a fair wind I'll post the Winter Equinox Solstice using Catfood Earth, which will replace Desktate.