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: "Like the Madrid Codex, the Dresden and Paris codices also contain a number of almanacs structured according to the 260-day tzolk'in calendar. Almanacs represent only one component of the Dresden Codex, however, which is unique in terms of the Maya codices in having astronomical tables that include Long Count dates. (The Long Count system of dating is commonly used on Classic period monuments to anchor historical events that are centered around the lives of the ruling family in time.) These tables were designed to track solar and lunar eclipses; the appearance and disappearance of Venus in the night sky; and the positioning of Mars against the constellations. Astronomical instruments occur in both the Paris and Grolier codices as well. A series of thirteen constellations representing the Maya "zodiac" appears on pages 23-24 of the Paris Codex (illustrated below), and the Grolier Codex contains an incomplete almanac that has many similarities to the Dresden Venus table."