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Results tagged with apparent-motion
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user 41328
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votes
Are there any old/ancient star maps that we can compare to today’s and see drastic differences?
The proper motion of most stars is extremely small, measured in milli-arcseconds per year, where an arcsecond is 1/3600 of a degree, and of course milli means a thousandth of that. One degree is 3,600 …
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