Who is that 17th century astronomical couple on my Kindle?

If you've ever put your Kindle2 to sleep, you may have seen this heavenly couple, Elisabeth and Johannes Hevelius, show up on your screensaver. But where does this image come from and why is it so famous? My recently-published article in the British Journal for the History of Science examines this and other images from Hevelius' same book, Machina Coelestis, which he deployed as a visual polemic against a new telescopic invention trumpeted by his rival Robert Hooke (of "Hooke's Law" fame) in England. Once again, the history of astronomy comes down to, Is it how big it is, or how you use it?