Tuesday, September 22, 2009

Analemmas: how they differ around the world and star system

Today is the fall equinox.

Some of you will recall the Analemma that I made a little while back. I put a sticker on the window and spent a year marking the location of the shadow at the same time every sunny day for a year.

Someone else went into greater detail about why it's a figure 8, how it changes depending on time of day and geographic location, and how it would appear on other planets. [link]

3 comments:

BrianAlt said...

When you started out, did you know it would crawl up your desk and cubical wall?

Ibid said...

Nope. At that point I didn't know what it would do other than form something 8 shaped.

BrianAlt said...

I figured that. I guess you were hoping it would go the other way.