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-Parallax: Apparent shift in position of an object when viewed against a background due only to different viewing positions of the observer. The Dip correction in Celestial Navigation is an example of parallax. (ex. Hold out your finger, shut one eye, then open it and shut the other. Your finger will appear to move relative to the background.)

-Photons - a discrete quantity of energy than can be thought of as a packet of electromagnetic radiation traveling at the speed of light

-Potential Energy the energy that a body possesses by virtue of its position with respect to other bodies in the field of gravity