second of arc

American  

noun

1. second.

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Example Sentences

See Examples For:

second of arc

This was a significant technical challenge, since, even for the nearest stars, parallax angles are usually only a fraction of a second of arc.

From Textbooks ● Oct. 13, 2016

University of Toronto astronomers, give results for the bending of a stellar ray just grazing the sun's edge, within one-hundredth of a second of arc of Einstein's prediction that they would be deflected 1.75 seconds.

From Time Magazine Archive

It includes 454,875 stars, nearly to the tenth magnitude, and their positions are reliable to about one second of arc.

From A Popular History of Astronomy During the Nineteenth Century Fourth Edition by Clerke, Agnes M. (Agnes Mary)

Several of the brightest stars, which might be expected to be the nearest, have not shown a parallax amounting to a twentieth of a second of arc.

From History of Astronomy by Forbes, George

Sec′ond-mark, the character ″ as the mark in mathematics for a second of arc, in architecture for inches, and as a sign for a second of time; Secon′do, the lower part in a duet.—adj.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various