Luna (goddess) Greek poet Hesiod, Hecate originally had power over the heavens, land, and sea, not as in the later tradition heaven, earth, and underworld. Luna (goddess) In ancient Roman religion and myth, Luna is the divine embodiment of the Moon (Latin "luna"; cf. English "lunar"). She is often presented as the female complement of the Sun (Sol) conceived of as a god. Luna is also sometimes represented as an aspect of the Roman triple goddess ("diva triformis"), along with Proserpina and Hecate. "Luna" is not always a distinct goddess, but sometimes rather an epithet that specializes a goddess, since both Diana
Celestial sphere the equatorial coordinate system, the celestial equator divides the celestial sphere into two halves: the northern and southern celestial hemispheres. Because astronomical objects are at such remote distances, casual observation of the sky offers no information on their actual distances. All celestial objects seem equally far away, as if fixed onto the inside of a sphere with a large but unknown radius, which appears to rotate westward overhead; meanwhile, Earth underfoot seems to remain still. For purposes of spherical astronomy, which is concerned only with the directions to celestial objects, it makes no difference if this is actually the case