On Sun, 25 Mar 2007 23:34:03 +0100, "George Dishman"
wrote:


"Henri Wilson" HW@.... wrote in message
George, when you can, have a look at
http://www.users.bigpond.com/hewn/ellip_circle.jpg

This shows how an elliptical orbit can produce a near perfect sine wave under
certain condition whilst the circular orbit produces nothing like one for
exactly the same parameter values.

Yaw angle is -90 (periastron closest to observer).

The white curve is an exact sinewave.

"When a true genius appears in the world, you may know
him by this sign, that the dunces are all in confederacy against him."
--Jonathan Swift.