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I spend a lot of time trying to imagine what it must have been like for a medieval astronomer to use an astrolabe.  It’s tricky.  Apart from all the things we might not know, like precisely who used them and why, there’s another major problem: light pollution.  Even in a small city like Cambridge the street lights blot out all but the brightest stars. Which is why I was blown away when I saw this picture: It is by French artist Thierry Cohen.  Here’s what his website says abo