Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4818.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4818. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Coordinates, Time, And Motion, Positional Concepts
Scientific paper
A four-dimensional geometrical framework that unites the three
dimensions of space and the dimension of time. A point in spacetime
(identified by four coordinates) is called an event (or `world-point').
The history of a particle (a line in four dimensions connecting all the
events at which it is present) is called a world-line....
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