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Fred,
You know what? That looks pretty darn cool. I really like how you've got the pole towards the pole of the sphere itself. Reminds me of the droplets that would appear in LightWave 3D for when you wanted to create texture maps for your models. The trails themselves form the lines of lattitude. Very cool!
I've never tried fixing gaps betwen star trails (I have one I'm working on at the moment). I'd imagine you'd need to find the centre of rotation and rotate the image around that point. But, then, you run the risk of screwing up the trails that are further out in the image as they often curve due to lens curvature.
How long was the gap between exposures?
My understanding is if you wish to have no gaps, then, you need to allow at maximum 700/focal_length as a rest between images.
H
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