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Rotating Earth

With a fixed camera we need to take short exposures to avoid trails

Then use software (app) to combine many separate exposures into one,
making a long total time

How short must each exposure be?

See the calculator on my web site: www.grelf.net/star_trails.html

Length of exposure depends on the required size of the final image:
for printing or only for screen display?

www.grelf.net/star_trails.html

The calculator looks like this:

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