Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another. The field of navigation includes four general categories: land navigation, marine navigation, aeronautic navigation, and space navigation.
Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
Isaac Newton, in Philosophiae Naturalis Principia Mathematica (1687) Laws of Motion, I
The motions of the heavenly bodies could be charted according to Ptolemy just as correctly as according to Copernicus.
Edwin Arthur Burtt, in The Metaphysical Foundations of Modern Physical Science (1924), Ch. 2 Copernicus and Kepler (A) The Problem of the New Astronomy
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