It's Equinox time

[bubbleblower]

It's Equinox time, when the plane of the Earth's equator lines up with the Sun.

There's an explanation at

http://en.wikipedia.org/wiki/Equinox

and you might also want to take a look at

http://www.plergb.com/Analemma/Analemma.shtml

You might want to look at this latter at various times of the year, following the Sun round and round the figure 8. It's updated hourly.