Sentence examples for second of arc from inspiring English sources
noun
An angle, one sixtieth (1/60th) of a minute of arc or one 3600th of a degree.
Angular motions were about 0.02 second of arc per year.
The best observatory sites have seeing between 0.5 and 1 second of arc.
Photographic resolution of about one second of arc is achievable today.
Thus, a 25-cm-diameter objective has a theoretical resolution of 0.45 second of arc and a 250-cm (100-inch) telescope has one of 0.045 second of arc.
For example, the parallax of 61 Cygni is 0.287 seconds of arc (1 second of arc = 1/3,600 of a degree).
The accuracy in modern first-order or geodetic instruments, with five-inch glass circles, is approximately one second of arc, or 1/3,600 of a degree.
It is usually measured in seconds of arc per year.
Seeing is expressed in units of seconds of arc, or 1/3,600 of a degree.
The excess was tiny, about 38 seconds of arc per century, compared with the 527 seconds of arc per century that Leverrier attributed to known planetary perturbations.
Barnard's star has the largest proper motion of any known star 10.25 seconds of arc annually.
(Some GRBs that were detected with X-rays could have their locations determined to within 10 seconds of arc).
