Today is the Spring (or Vernal) Equinox, so I have been having a look at a few sites about it.
The BBC’s religions site has a page on the Spring Equinox
And the Religious Tolerance Organisation has an interesting article looking at the Spring Equinox in different beliefs.
Wikipedia has interesting info on Equinoxes generally.
I came across this fantastically long-ranging list of Vernal Equinox Dates and Times of Day each year for 1096 years
1452 – 2547′
This astronomy site includes a movie illustrating the tilt of the Earth’s equatorial plane relative to the Sun, and also, discusses the superstition that it is possible to stand an egg upright on its end on the date of the equinoxes