"The Little Horse"
History: There is little reference to Equuleus in classical mythology, although it probably isn't a newer constellation. Equuleus was mentioned in The Almagest -- the work of Claudius Ptolemy, who published the work in the second century A.D. In it, he formally describes a geocentric (Earth-centered) cosmology. It is speculated that this constellation was described by Hipparchus -- the Greek philosopher-scientist who first calculated the length of the Tropical Year to a high degree of accuracy in the second century B.C..