**General
Relativity**

The son of Herman and Pauline Einstein, Albert Einstein was born in Bern on March 14, 1879, in Ulm, Germany. [TBD]

Philosophical Concepts - Quotes from Einstein regarding physical concepts such as

Physical concepts are free creations of the human mind, and are not, however it may seem, uniquely determined by the external world.

One day in
the year 1666 Newton had gone to the country, and seeing the fall of an apple, as his
niece told me, let himself be led into a deep meditation on the cause which thus draws
every object along a line whose extension would pass through the center of the Earth
– Voltaire (1738)

"Einstein's gravitational field," by Peter M. Brown (physics/0204044), Historical article

**Basic Principles in General
Relativity**

I do not agree with the idea that the general theory of relativity is geometerizing Physics or the gravitational field. The concepts of Physics have always been geometrical concepts and I cannot see why the g

_{ik}field should be called more more geometrical that f.i. the electromagnetic field or the distance of bodies in Newtonian Mechanics. The notion comes probably from the fact that the mathematical origin of the g_{ik}field is the Gaussian Riemann theory of the metrical continuum which we are wont to look at as part of geometry. I am convinced, however, that the distinction between geometrical and other kinds of fields is not logically founded.-From a letter from Albert Einstein to Lincoln Barnett

- Gravitational Force in General Relativity
- Weight of a Moving Body
- Uniform Gravitational Field
- Gravitational Force in a Uniform Field
- Speed of Light in a Gravitational Field (See Ohanian)
- Conserved Quantities
- Gravitomagnetism
- Gravitational Field in a Cavity
- The Gravitational Field
- Photon Doppler Measured by an Observer in Free-Fall
- Gravitational Force on a Falling Particle
- Embedding Diagrams (TBD)
- Geodesic Deviation
- Einstein's Field Equations
- Newtonian Limit
- Weak Field Limit
- Gravitational
Field of an Infinitely Long Rod
- Background Lorentz Transformation
- Gravitational Field of a Large Sheet
- Gravitational Field of a Moving Rod
- Inertial Force
- Gravitational Field of a Moving Sheet
- Gravitational Field vs Spacetime Curvature
- The Gravitational Field of a Directed Beam of Light
- Gravitational Red Shift
- Active Gravitational Mass
- Geodesic Equation
- Coordinate Acceleration
- Potentials in General Relativity
- Gravitational Field of an Infinitely Long Rod
- Gravitational Field of a Large Sheet
- Gravitational Field of a Long Moving Rod
- Gravitational Field of a Large Moving Sheet
- General Gravitational Red shift
- Lorentz Factor for a Uniform Gravitational Field
- The Concept of Mass
- Newtonian Limit
- Circle Universe
- Jacobian matrix for Cartesian/Spherical coordinate transformation
- Jacobian for Cartesian/Spherical coordinate transformation
- [TBD]
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- ...
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**Fourth Test of General Relativity**
by Shapiro, et al, *Phys. Rev. Lett.* Vol. 20(22), Dec. 28 1964

**Fourth Test of General Relativity:
Preliminary Result** by Shapiro, et al, *Phys. Rev. Lett.* Vol.
20(22), Dec. 28 1968