Sunday, March 21, 2010

The Seasons

I'm writing this at almost the the exact time of the Vernal Equinox. And you can think of this as the First Day of Spring or the Middle of Spring.

The first day of spring is traditional.

The Middle of Spring relies on 'Cross-Quarter-Days' to define the start of the seasons.

One of the blogs I read is the 'Bad Astronomy Blog' and Phil Plait usually has a post about the Equinox each time it happens. This post: 'Fake Equinox' has a link to an earlier post 'Bad Seasons' which talks about starting the seasons on the cross-quarter days.

Well when I read that I thought, "Wow that sounds familiar!" and this is the web page that makes the same point 'Another Way Of Looking At When The Seasons Start'.

I first wrote the web page back in 2000 and I do note that Phil Plait wrote his in the late 1990's.