Hi guys, here is an animation I made yesterday by downloading 120 pictures of the Earth taken 12 minutes apart by satelites above the equator at 30 degrees longitude west on 10/01/2010. The pictures are 500 x 500 pixels and they are pasted as a background of a chart by a slimmed down VBA macro. You can change the speed of the model. The time increment is fixed however at 12 minutes between snapshots. This is a brute force sprite animation and I had to tinker with the macro to make it work without blinks. This will work fine in Excel 2007.
The pictures are generated by the “Earth Viewer” which was first implemented by John Walker in December 1994. Most of the software that generates the various views of the Earth was adapted from Home Planet for Windows. The satellite tracking code is based upon the N3EMO Orbit Simulator. Enjoy, George
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