 Decans measure sidereal time and the solar year is six hours longer; the Sothic and solar years in the Egyptian calendar realign every 1460 years.Decans represented on coffins from later dynasties (such as King Seti I) compared with earlier decan images demonstrate the Sothic-solar shift.According to Sarah Symons

Although we know the names of the decans, and in some cases can translate the names ("Hry-ib wiA" means 'in the centre of the boat') the locations of the decanal stars and their relationships to modern star names and constellations are not known.