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3 Responses to “ How many unique stars have been counted in the history of all human astronomy? ”
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The Stars
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That depends entirely on your definition of “unique.”
I would say, ZERO, since every single star goes through fusion, making none of them unique at all.
Stars have been listed in so-called catalogues. There are several star catalogues in use now worldwide. One is the Hipparcos (or Tycho) catalogue. According to Wikipedia it lists around 118,000 stars. Other catalogues may come up with a different figure. I think this gives you a sense of the amount we are talking here.
If you want to learn more about the catalogues and how big they are, see my link below.
The biggest existing star catalog is Tycho-2, which lists 2,539,913 stars.
http://en.wikipedia.org/wiki/Tycho-2_Catalogue
There are more known stars, but these are in distant galaxies and not known as individual stars but by special visual events.