Taurus (constellation) is a white, spectral class B7 III giant star known as "El Nath", which comes from the Arabic phrase "the butting", as in butting by the horns of the bull. At magnitude 1.65, it is the second brightest star in the constellation, and shares the border with the neighboring constellation of Auriga. As a result, it also bears the designation Gamma Aurigae. Zeta Tauri (the proper name is "Tianguan") is an eclipsing binary star that completes an orbit every 133 days. A degree to the northwest of ζ Tauri is the Crab Nebula (M1), a supernova remnant. This expanding nebula
Cerberus (constellation) Cerberus (constellation) Cerberus is an obsolete constellation created by Hevelius, whose stars are now included in the constellation Hercules. It was depicted as a three-headed snake that Hercules is holding in his hand. The constellation is no longer in use. This constellation "figure typified the serpent ... infesting the country around Taenarum the Μέτωπον of Greece, the modern Cape Matapan." The presence of Cerberus (Kerberos) at Taenarum (Tainaron) is mentioned by Strabo, Statius, and Seneca the Younger. John Senex combined this constellation with the likewise obsolete constellation Ramus Pomifer, an apple branch held by Hercules, in his 1721 star map