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Thanks Guy's,
Seb, although the rotation rate of Venus is quite slow, its day is longer than its year, at high alt the winds are very strong and these high alt cloud features complete a rotation around the planet in just under 4 Earth days.
Stuart, I use some rather old software, PSP 8, which back then came with "Animation Shop". It can be launched from the main "File" menu from the "Jasc Software Products" tab.
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