» Analemma was also a book by Ptolemy. In astronomy, an analemma (IPA: /ˌænəˈlɛmə/, Greek for the pedestal of a sundial)'s a curve representing the angular offset of a celestial body (usually the Sun) from its mean position on the celestial sphere as viewed from another celestial body (usually the Earth). For instance, knowing that Earth's average solar day's almost exactly 24 hours, an analemma can be traced by plotting the position of the Sun as viewed from a fix… (More on Analemma)