Ancient nations of the American continent had different calendar systems and distinctive astronomy and astrology. For example, Maya people had the Solar calendar “Haab’” consisting of 365 days and 12 Zodiac signs, but they also had the calendar “Tzolk’in” with 260 days, which they used for ritual purposes. The shorter calendar consisted of 13 months, 20 days each, and it was devoted to Quetzalcoatl, the Supreme God of many Central America’s nations.