arc second


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Related to arc second: parsec, radian

arc second

(arcsec; second of arc) Symbol: ″. A unit of angular measure equal to 1/3600 of a degree. It is used, for example, to give the apparent diameter of objects, the angular separation of binary stars, and the proper motion and annual parallax of stars. An arc minute, symbol: ′, is 60 arc seconds, i.e. 1/60 of a degree. The full Moon is about 30′ in diameter.
References in periodicals archive ?
Arc Second had the system independently tested in two ways.
Arc Second develops, manufactures, and markets 3D-Intelligence (3D-I) measurement and tracking products and mobile CAD software solutions.
Edward Barrientos will be relinquishing his role as President and CEO of Arc Second and will join the Metris Board of Directors.
I know because I backed Highland Reel, subsequently a King George winner and Arc second.
shows two distinct sources barely 1 arc second apart [that] coincide with radio sources detected earlier at the Very Large Array.
Last year's Arc second Mubtaker was expected to head our raiding party in the valuable contest at Baden Baden, with Warrsan and the Kieren Fallon-ridden Gamut playing supporting roles.
A double enveloping gear on the rotary table and mechanical disk brake with 12 pads ensure accuracy of [+ or -] 5 arc sec and repeatability of [+ or -] 1 arc second.
Its operating specifications include an angle range of [+ or -][degrees]C, resolution of 1 arc second and null repeatability of [less than or equal to]5 arc seconds.
Barrientos also added, "With X-Station, Arc Second has created a new class of portable instruments that spans the breadth of measurement applications from construction to high-precision metrology applications.
com VVJAPAN Arc second Orfevre starts season with an odds-on victory
The C-axis accuracy is 15 arc seconds with a [+ or -]5 arc second repeatability.
5 arc second with a [+ or -]2 arc second repeatability.