This year-long time lapse video (compressed to five minutes) shows the sky above the Exploratorium in San Francisco, as the sun rises, clouds float by, and night falls. This video is special because it shows the days in a grid, in chronological order (starting in the upper left with July 29, 2009 and ending in the lower right with some day in July 2010) -- you can see gray days and blue days and how the shorter days (in the middle of the video frame) start later and end earlier. When you blow it up to fullscreen 1080p, you can see the counter in the bottom right showing the time, and you can note things like wind direction, rainy days, and the relative color of the sky on different days. Here's a note from creator Ken Murphy, explaining the project:

This is a year-long time-lapse study of the sky. A camera installed on the roof of the Exploratorium museum in San Francisco captured an image of the sky every 10 seconds. From these images, I created a mosaic of time-lapse movies, each showing a single day. The days are arranged in chronological order. My intent was to reveal the patterns of light and weather over the course of a year.

This video is designed to be viewed in a large format, so it's best viewed in full-screen mode at 1080p.

Actually it's only 360 days (to make a nice grid), but close enough. Enjoy, and please do bump it up to HD/fullscreen -- it makes a difference:

More information on the project site (including shots of the camera rig) and at this blog post.

(Via Data Pointed.)