Glossary -- Table of Contents . ... Angle of attack . ... Rotation axis of the Earth . ... Anomaly -- in orbital motion, one of the angles which gauges the motion of a planet or satellite around its orbit, increasing by 360 o every revolution. The true anomaly f equals the polar angle f in polar coordinates with origin at the center of the motion (e.g. Sun or Earth). ... Planets -- Celestial bodies such as the Earth which orbit the Sun (and by extension, similar orbiters around distant stars). ...