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Field use is the only way I’m afraid.
What you need is the longest focal length you’ve got and use a program like PHD2 to track a bright star over time.
Taking 1s exposures and having software track it over a long period (2 hours?) will give you multiple cycles. One you have the star movement you open up the log file in something like PemPro.
I’ve never done any of this personally (never measured my PE this way) so others can help more on this topic.
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