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 arcsecond

arcsecond, plural arcseconds; gradus minutus secundus = [Latin] second diminished degree

An arcsecond or second of arc is a measure of angle. An arcsecond is the 60th part of an arcminute.