Relativity

n. (Physics) theory of relativity as developed by Albert Einstein, theory that time and space are relative concepts and that motion must be defined in relation to a point of reference

Relativity may refer to:PhysicsSpecial relativity, a theory of physics formulated by Albert EinsteinGeneral relativity, Einstein's theory of gravitationEinstein's theory of relativity, which refers to both special relativity and general relativity togetherPrinciple of relativity, used in Einstein's theories and derived from Galileo's principleGalilean relativity, Galileo's conception of relativityNumerical relativity, a subfield of computational physics that aims to establish numerical solutions to Einstein's field equations in general relativity
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Noun
1. (physics) the theory that space and time are relative concepts rather than absolute concepts
(synonym) theory of relativity, relativity theory, Einstein's theory of relativity
(hypernym) scientific theory
(hyponym) general relativity, general theory of relativity, general relativity theory, Einstein's general theory of relativity
(classification) physics, physical science, natural philosophy
(class) event

(n.)
The state of being relative; as, the relativity of a subject.
  

Relativity Associated with Einsteinian physics; the first postulate of the theory of relativity is the relativity of all motion, a return to the idea of Newton, which holds that there is no stationary ether or any fixed system of coordinates in space, with regard to which motion can be measured. The second postulate states that the velocity of light in free space appears the same to all observers regardless of the relative motion of the source of light and of the observer. A well-known feature of the theory is that by which space and time are no longer treated as independent, but as component elements of a four-dimensional continuum, space-time, and in which the objects whose position and motion are measured are called events. This is a movement in the direction of simplification, since it economizes the number of separate data which we must assume in order to build up our system of interpretation. Einstein also postulates the relativity of the force concept, thus obviating the objection that the Ptolemaic system is dynamically inadequate as compared with the Copernican.
Apart from this scientific use of relativity, its wider meaning is of prime importance in theosophy. Though we may say, in a general way, that all things are relative to each other, yet for purposes of reasoning or calculation it is necessary to assume certain things as constant; as for instance, in measuring velocities on the earth, we may assume that the earth is motionless; though when we enter the field of astronomy, we regard the earth as in motion with regard to the sun, and again may regard the sun as in motion relatively to some other position assumed as at rest. By applying this principle we arrive at the conclusion that nothing in the universe, whether physical, astral, mental, or spiritual, is completely specified to our human mind except by its relations to other things. This principle is expressed by such sayings as that all objects are manifestations of a universal principle or that there are no absolutes.
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