It's Spring.

Spring is also the title of the photo set by St. Louis blogger Shelley Powers that includes this wonderful moment, from a human perspective.

And it's the day that's as long as the night, except in Guam:

The first day of spring is called the vernal equinox and vernal equinox directly translates from the Latin as Green Equal Night. In theory, all parts of the world have a 12-hour day and a 12-hour night. It isn't true here, our "green equal night" occurred last Monday, the 12th of March, when the sun rose and set at 6:31. Spring or vernal equinox occurs when the sun is straight over the equator and that will happen at 10:06 a.m. next Wednesday.

Discover Magazine relaunched today with the natural event in mind, according to its press release,

The website relaunch will coincide with the Spring Equinox (March 20), a longstanding symbol of rebirth and renewal.

And grapes. The nifty video player that leads its homepage alternates between a YouTube-style "Play" arrow and a video still of a lovely bunch of blue grapes. Grapes are lush symbols, too.

Looking up? Tonight's Sky for Tuesday, Mar 20 2007 at Earth & Sky.