Not so long ago I mentioned great city of Alexandria in post Constantine & Naissus when I described the horrible misfortune and death of Hypatia, one of the greatest philosopher and astronomer of 4th century AD, who lived at the very end of classical Greek era of prosperity. Within the same city walls, couple of centuries before, one of the equally greatest and famous scientists of all times, Claudius Ptolemy was living, exploring, teaching and dedicating his life in various disciplines including astronomy and, of course, unavoidable astrology which was considered to be "connected science" for centuries, especially in the old ages. Rachel Weisz as Hypatia of Alexandria in Agora (2009) Among other things, Ptolemy will be remembered as the one of first scholars who described and identified 48 constellations of clear and unpolluted nightly skies above Alexandria so many centuries ago. One of the biggest constellations in his list was the great constellation of Gem...