Ancient Maya Astronomy:
The ancient Maya were keen astronomers, recording and interpreting every aspect of the sky. As they believed that the will and actions of the Gods could be read in the stars, moon and planets, they dedicated much time to doing so and many of their most important buildings were constructed with astronomy in mind. The Sun, Moon and planets (Venus in particular) were studied by the Maya. The Maya also based their calendars around astronomy.
The Maya believed that the Earth was the center of all things, fixed and immovable. The stars, moons, sun and planets were gods: their movements were seen as them going between the Earth, the Underworld and other celestial destinations. These Gods were greatly involved in human affairs, and so their movements were watched closely. Many events in Maya life were planned to coincide with certain celestial moments: for example, a war might be delayed until the Gods were in place, or a ruler might ascend to the throne of a Maya city-state only when a certain planet was visible in the night sky