CB:
"..Even though classical mechanics ( that of Galilei-Newton) does not supply us with a sufficiently broad basis for the theoretical presentation of all physical phenomena, still we must grant it a considerable measure of “truth,” since it supplies us with the actual motions of the heavenly bodies with a delicacy of detail little short of wonderful. " - Albert Einstein (1879–1955). Relativity: The Special and General Theory. 1920.
http://www.bartleby.com/173/5.html
V. The Principle of Relativity (In the Restricted Sense)