Secchi ( lunar crater ) Crater characteristics Coordinates 2.4° N , 43.5° E Diameter 25 km Depth 1.9 km Colongitude    317° at sunrise Eponym P. Angelo Secchi Secchi is a small lunar crater formation on the northwest edge of Mare Fecunditatis . To the northeast is the Taruntius crater . The western rim is joined with a section of the minor Montes Secchi range . The rim of this crater has been opened in the north and south ends , leaving two curved ridges facing each other across the crater floor . To the south is a pair of rilles designated the Rimae Secchi . These lie near the edge of the mare , and have a combined length of about 40 kilometers . 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 Secchi crater . Secchi Latitude Longitude Diameter A 3.3° N 41.5° E 5 km B 3.7° N 41.5° E 5 km G 4.0° N 44.6° E 8 km K 0.2° S 45.4° E 3 km U 1.1° N 42.2° E 6 km X 0.7° S 43.6° 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 2.4 N 43.5 E 25 km 1.9 km 317 P. Angelo Secchi 