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To Claudius Ptolemy, however, we are indebted for the first concise and scientific statement of its principles and practice, so far as Europe is concerned.

If you imagine these bodies to be revolving in a plane around the Sun and yourself to be standing within the Sun, the motions of these bodies will appear almost uniform and always in one direction.What is known regarding planetary action in human life is known with great certainty, and the effects of one planet can never be confounded with those of another.Incomplete as it must needs be, it is yet a veritable science both as to its principles and practice.Astronomers employ an imaginary circular orbit for the planets, in which they move at an uniform rate of velocity, which is called the mean motion.This is subject to an equation depending on the position of the planet in its orbit, and it determines the difference between the imaginary planet and the true planet.