A standard position of the body: The anatomic position is used to describe a person's posture when standing erect against a wall, facing directly forward, feet pointed forward and slightly apart, and arms hanging down at the sides with the palms facing forward.

The beginning point of a joint range of motion: An anatomic zero joint position was explained by the professor to be descriptive of the preluding stage of the span of movement of a joint before actual movement begins.

One of a set of five positions at which a small object can maintain a stable orbit under the influence of two more massive objects: A Lagrangian position is a point in space at which a small body, under the gravitational influence of two large ones, will remain approximately at rest relative to them.

The existence of such points was deduced by the French mathematician and astronomer Joseph-Louis Lagrange in 1772.

In 1906, the first examples were discovered. These were minor planets moving in Jupiter’s orbit, under the influence of Jupiter and the Sun.

The orbits and positions of the planets: Wanderers could not be accurately accounted for before the invention of the telescope although star positions were known.

Understanding came with the revolutionary work of Galileo, Brahe, and Kepler which, together with Newton's contributions, finally swept away the Greek concept of an earth-centered universe and established the present model of the solar system.

The Greeks had simplified celestial mechanics according to the simple doctrine that "matter behaves according to nature."