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Johannes Hevelius (1611-1687). Historical artwork of the Polish astronomer Johannes Hevelius and his wife Elisabetha observing the stars with a sextant. This is an illustration from Hevelius' book Machina Coelestis (Celestial Machine, 1673). Hevelius invented ten new constellations, seven of which are still recognized by astronomers. Elisabetha Koopman, Hevelius' second wife and assistant, completed her husband's final project after his death. Extract from Weltall und Menscheit (Universe and Humanity), by Hans Kraemer (ca.
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