second of arc

noun

1. second.

Example Sentences

By comparison, the human eye can resolve structures separated by at best about 40 seconds of arc, and even the Hubble Space Telescope can achieve a resolution of only about 0.04 second of arc.

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But measures of parallax made by Herman S. Davis and Wilsing seem to show a difference of parallax between the two components of about 0·08 of a second of arc.

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Its length is equal to the distance of a star whose parallax is one second of arc; that is, one parsec is equal to about three and a quarter light-years.

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Only a very few seconds apart they are or, in many cases, only the merest fraction of a second of arc.

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By applying the interferometer method to Capella, arc distances of much less than one-twentieth of a second of arc were measured.

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