Lunar landscape observations. 1882 artwork showing observations made of lunar craters and mountains. At top is the Eratosthenes crater and the Montes Apenninus mountains at sunrise. At lower left is the landscape around the Tycho crater at sunset. At lower right is the Montes Caucasus mountains at sunset. The captions are in German. The mapping of the Moon with telescopes started with Galileo in 1610, and then developed further over the centuries as telescopes improved. The observations, like those seen here, included recording changes in the shadows cast by high mountains and deep craters during the lunar day-night cycle.