Eclipse Temperatures of the Lunar Crater Tycho

Shorthill, Borough, and Conley discovered during the total eclipse of the Moon on 13 March 1960 that the floor of the crater Tycho did not cool as much as the surrounding area, but remained some 40 to 60° warmer [1]. They found that other rayed craters, specifically Copernicus and Aristarchus, also remained warmer than their surroundings.