— 191 —
Time not the measure of Motion.       §22. One thing seems strange to me, that whilst all Men mani-
festly measured Time by the motion of the great and visible Bodies
of the World, Time yet should be defined to be the measure of Motion:
whereas ’tis obvious to every one, who reflects ever so little on it,
that, to measure Motion, Space is as necessary to be considered as
Time; and those who look a little farther, will find also the bulk of
the thing moved necessary to be taken into the Computation, by
any one who will estimate or measure Motion, so as to judge right
of it. Nor, indeed, does Motion any otherwise conduce to the
measuring of Duration, than as it constantly brings about the
return of certain sensible Ideas, in seeming equidistant Periods. For
if the Motion of the Sun, were as unequal as of a Ship driven by
unsteady Winds, sometimes very slow, and at others, irregularly
very swift; or if being constantly equally swift, it yet was not
circular, and produced not the same Appearances, it would not at
all help us to measure time, any more than the seeming unequal
motion of a Comet does.
Locke Hum II, 14, §22, p. 191