Noun
the inverse function of the secant; the angle that has a secant equal to a given number
Source: WordNetA proper motion of 1 arcsec per year at a distance of 1 light-year corresponds to a relative transverse speed of 1.45 km/s. Source: Internet
During the past 50 years, 7,435 Schmidt camera plates were used to complete several sky surveys that make the data in USNO-B1.0 accurate to within 0.2 arcsec. Source: Internet
A second of arc, arcsecond (arcsec), or arc second is of an arcminute, of a degree, of a turn, and (about ) of a radian. Source: Internet
The notation using the "arc-" prefix avoids such confusion, though "arcsec" for arcsecant can be confused with " arcsecond ". Source: Internet
Image is 60 arcsec on a side. Source: Internet