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Archive for March 24th, 2009

Plotting the analemma on your window

March 24, 2009 @ 16:01 By: gordon Category: Astronomy, Photography

Near the end of January, I posted some pictures I took of sunrise one morning. Last week, on the first day of Spring, I took some more pictures at sunrise. Here’s a photo from each day, side by side for your viewing convenience:

January 21, 2009
First sunrise of Spring 2009 002
March 20, 2009

The astute observer will have noticed that the sun is rising 10 to 20 degrees to the left of where it did on January 21st. This got me to thinking that there’s an experiment you can try at home based on this difference.