The term classical mechanics was coined in the
early 20th century to describe the system of physics
begun by Isaac Newton and many contemporary 17th century
natural philosophers, building upon the earlier
astronomical theories of Johannes Kepler, which in turn
were based on the precise observations of Tycho Brahe
and the studies of terrestrial projectile motion of
Galileo. Because these aspects of physics were developed
long before the emergence of quantum physics and
relativity, some sources exclude Einstein's theory of
relativity from this category. However, a number of
modern sources do include relativistic mechanics, which
in their view represents classical mechanics in its most
developed and most accurate form. [Adapted from
Wikipedia]
