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Allen, I have attached 2 animations. Your answer to the following two questions might clear things up a bit: Which of the two animations displays A) ..your "radial condition"? B) ..no rotation - only translational movement? I will refer to those two animations as Ani.3 (=EarthOrb3_90.gif) and Ani.4 (=EarthOrb3_90_trop.gif). - Regner
Attachment:
EarthOrb3_90.gif
Description: GIF image
Attachment:
EarthOrb3_90_trop.gif
Description: GIF image