Ophiuchus constellation, 17th century artwork. Ophiuchus (Serpentarius), the serpent bearer, is not one of the 12 star signs but is considered to be of some zodiacal significance. This illustration is from Johann Bayer's Uranometria (Greek for 'sky measurements'), a star atlas and catalogue that contains a total of 51 stellar maps. The book, published in 1603, was the first of its kind since it portrayed the constellations as maps rather than as mythological pictures. Each engraving has a reference grid so that the stars' positions in the sky can be precisely determined.
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