For details see William L. and Peter L. Scott Burke, Special Relativity Primer (Santa Cruz: Department of Physics --- photocopied manual, 1978); William L. Burke, Spacetime, Geometry, Cosmology (Mill Valley, California: University Science Books, 1980); Edwin F. & John Archibald Wheeler Taylor, Spacetime Physics (San Francisco: W. H. Freeman and Company, 1963 (revised, 1992)). For a short introduction see James Trefil and Robert M. Hazen, The Sciences: An Integrated Approach, Second Edition / Updated Edition (New York: John Wiley & Sons, Inc., 2000), Ch. 13. See also the elegant treatment in Charles W. Misner, Kip S. Thorne and John Archibald Wheeler, Gravitation (San Francisco: W. H. Freeman and Company, 1973). For helpful insights see Mark W. Worthing, God, Creation, and Contemporary Physics, Theology and the Sciences Series (Minneapolis: Fortress Press, 1996), 23-26.