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Pronunciation varies by accent · noun
A unit of angle; 1/60th of an arcminute, or 1/3600th of a degree..
Use arc second when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Arc second means A unit of angle; 1/60th of an arcminute, or 1/3600th of a degree..
Common synonyms include second of arc, as, arcsec, second.
The opposite depends on the specific sense.
Use arc second where its definition matches the intended context.
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