Assertion: motion's motion | /r/HasProperty | measured
Facets:
value: by comparing it
type: MANNER
value: in seconds of arc per year
type: TEMPORAL
value: generally
type: DEGREE
Source sentences:
text: Proper motion is generally measured in seconds of arc per year; the largest known is that of Barnard’s star in the constellation Ophiuchus, about 10″ yearly.
text: For example, if Einstein's Theory of Relativity is correct, absolute motion with reference to three-dimensional space would be replaced with the idea that there is no absolute frame of reference since the motion of anything can only be measured by comparing it relatively with the motion of something else—gravity, acceleration, and motion affect the measurment of time and space.