In the Courts of the Crimson Kings In the Courts of the Crimson Kings In the Courts of the Crimson Kings is a 2008 alternate history science fiction novel by American writer S. M. Stirling. The story takes place on the planet Mars in an alternate solar system where probes from the United States of America and the Soviet Union find intelligent life and civilizations on both Venus and Mars. The book is heavily influenced by the works of writers such as Edgar Rice Burroughs, Ray Bradbury, and Leigh Brackett, among others. It is a sequel to "The Sky People", which is set on Venus. Stirling later
Deferent and epicycle prograde motion. Near opposition, the planet would appear to reverse and move through the night sky faster than the stars for a time in retrograde motion before reversing again and resuming prograde. Epicyclic theory, in part, sought to explain this behavior. The inferior planets were always observed to be near the Sun, appearing only shortly before sunrise or shortly after sunset. Their apparent retrograde motion occurs during the transition between evening star into morning star, as they pass between the Earth and the Sun. When ancient astronomers viewed the sky, they saw the Sun, Moon, and stars moving overhead in