![]() The most interesting of these objects is the great nebula in Andromeda, now known as M31. (from Wikipedia) Schiller’s maps are distinguished by a good graduation of stellar magnitudes, three new stars, and several newly discovered nebulae. This object, clearly visible to the naked eye, was not reported by Ptolemy, and it was apparently not noticed by any of the medieval or Renaissance astronomers whose work followed from his. ![]() ![]() While some of these, seen through newly invented telescopes, have since proven to be ghosts, others proved true. ![]()
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