Astronomy Answers: From the Astronomical Dictionary

Astronomy Answers
From the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

the parallax

The parallax is a motion that an object seems to make because the observer has moved to a different location. The parallax of a star is the angle over which the star moves during a year because of the motion of the Earth around the Sun. If that parallax is equal to (p) arcseconds, then that star is at (1/p) parsec from the Earth.