Its moon Phobos orbits the planet in 7 hours, rises in the west, & sets in the east
... of Mars 
that the curvature of the planet would obscure its view from an... [DOC] [TLE] The Moons of Mars - Australian Space Academy [PAR] They orbit quite close to the planet, and Phobos, the inner and larger moon, has 
... orbits its planet in less time than it takes the planet to rotate about its axis.