Polish astronomer Johannes Hevelius (1611-1687) and his wife Elisabetha observing the stars. This is an illustration from Hevelius' book "Machina Coelestis" (Celestial Machine). 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. Color enhancement of BN2268.