In the Phaseis (Risings of the Fixed Stars), Ptolemy gave a parapegma, a star calendar or almanac, based on the appearances and disappearances of stars over the course of the solar year.
I Phaseis (stigen af de faste stjerner) gav Ptolemæus en parapegma, en stjernekalender eller almanak, baseret på fremkomster og forsvindinger af stjerner i løbet af solåret.