Assertion: tangential motion | /r/HasProperty | small
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Source sentences:
text: If the star is far away or its tangential motion is small it may take millennia to observe any change in its position; but if the star is very close to us, so that any motion it has looks relatively large, or if it is at a more moderate distance but is moving sideways at a rapid rate we may be able to observe a change in its position and calculate its tangential motion in just a few decades.