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Science is always moving the goal posts
There wasn't much science in his day but there was a lot of discussion among the learned about what Earth's position in the Universe was. Did you know that the idea of a heliocentric Solar system was first published by Rheticus, a collaborator? Pissed Rheticus off no end with the publication of De revolutionibus.
Copernicus didn't believe what he was being told.
originally posted by: Phage
a reply to: charlyv
Sirius is a white dwarf. This means its spectrum is quite even across visible wavelengths, though its spectrum does peak in the blue. I don't think two anecdotal references on its color can be relied upon.
On the other hand, Sirius is known to scintillate quite spectacularly. Sometimes misidentified as a UFO.