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The Theory of Relativity is a geometrical theory of gravitation, it postulates that the [[speed of light]] and laws of physics are constant for all (inertial) observers, regardless of their velocities relative to each other.

Relativity refers to two [[physics]] theories; general relativity (GR) and special relativity (SR), put foward by [[Albert Einstein]]. The Theory of Relativity is a geometrical theory of gravitation, while Special Relativity is a limited case. Einstein formed two postulates around which the theory is based:

 

# The [[speed of light]] is constant for all (inertial) observers, regardless of their velocities relative to each other.

# The laws of physics are obeyed in all reference frames.

The theory of relativity was first proposed based on mathematical theory developed by [[Henri Poincaré]] and [[Hendrik Lorentz]]. This theory differs from [[Isaac Newton]]'s theory of gravitation by disposing with the idea of a universal, mutually agreeable scale of time (i.e. a universal clock that all times can refer to) and space (i.e. a universal sheet of "graph paper", which location refers to).  

The theory of relativity was first proposed based on mathematical theory developed by [[Henri Poincaré]] and [[Hendrik Lorentz]]. This theory differs from [[Isaac Newton]]'s theory of gravitation by disposing with the idea of a universal, mutually agreeable scale of time (i.e. a universal clock that all times can refer to) and space (i.e. a universal sheet of "graph paper", which location refers to).