Geocentric model the coordinate system in order to predict the motions of planetary bodies, though doing so may make calculations easier to perform or interpret. A geocentric coordinate system can be more convenient when dealing only with bodies mostly influenced by the gravity of the Earth (such as artificial satellites and the Moon), or when calculating what the sky will look like when viewed from Earth (as opposed to an imaginary observer looking down on the entire solar system, where a different coordinate system might be more convenient). The Ptolemaic model of the solar system held sway into the early modern age;
Central Township, Perry County, Missouri Central Township, Perry County, Missouri Central Township is one of the eight townships located in Perry County, Missouri, in the United States of America. Central Township is located in the central part of Perry County, and hence so named. The Geographic Names Information System (GNIS) lists five townships name "Central", including this one, in various counties of Missouri. The first European settlers in what is now Central Township arrived in 1800 and were Kentuckians who laid down farms around "The Barrens". They had called their home in Kentucky "The Barrens", a term used extensively to describe land which combines some