Thales ( crater ) Crater characteristics Coordinates 61.8° N , 50.3° E Diameter 32 km Depth 1.8 km Colongitude    314° at sunrise Eponym Thales Thales is a small crater located in the northeast part of the Moon , just to the west of the larger Strabo crater . To the southeast is the De La Rue walled-plain . Thales has a sharp , circular rim that has received little erosion . The lunar surface around Thales has a ray system that extends for over 600 kilometers . An area to the north-northwest of the crater is free of rays , however , indicating that the crater may have been formed by a low-angle impact from that direction . The inner wall has some terraces , particularly along the southern side . The sides have a higher albedo than the typical lunar terrain . This crater has been noted for transient lunar phenomena . In 1892 , E. E. Barnard observed a pale haze fill the crater interior , while the surroundings remained clear and sharply visible . Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Thales crater . Thales Latitude Longitude Diameter A 58.5° N 40.8° E 12 km E 57.2° N 43.2° E 29 km F 59.4° N 42.1° E 37 km G 61.6° N 45.3° E 12 km H 60.3° N 48.0° E 10 km W 58.5° N 39.8° E 6 km References See the reference table for the general listing of literature and web sites that were used in the compilation of this page . Categories : Craters on the Moon 61.8 N 50.3 E 32 km 1.8 km 314 Thales 