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 ?
By actually building such a system, Arc Second has positioned itself to radically change the metrology marketplace as well as the manufacturing process itself.
With the Black Sun release, Arc Second firmly plants Indoor GPS as the technology to beat in the fast growing market for large-scale metrology and positioning systems.
In his debut crop, the Australian import sired the Derby sixth and Arc second Glenard Sunrise, out of a Larkhill Jo bitch, but his offspring have enjoyed little success in finals.
The V-Bar is opening a new era of un-tethered and truly portable hand-held measurement," said Edward Barrientos, president of Arc Second, Inc.
However, his granddam is a half-sister to Group 1-placed Behkara, dam of Grand Prix de Paris winner Behkabad and high-class Beheshtam, descending from Arc second Behera.
Indexing accuracy of the contouring-capable table is [+ or -]2 arc seconds with repeatability of 1 arc second.
We didn't see it at 1 arc second away from van Biesbroeck 8, where McCarthy said it was, and we should easily have been able to see it," says Skrutskie.
com VVJAPAN Arc second Orfevre starts season with an odds-on victory
5 arc second terrain resolution, among the highest resolution terrain available in the industry.
Gentildonna and Arc second Orfevre battled it out in the final furlong.
The angle between the surfaces of the multiangular prism is considered to be the reference angle and in most cases its error value does not exceed a tenth of an arc second.
The Trimble SPS930 Universal Total Station is accurate to one arc second in the vertical and horizontal angles, making it ideal for fine grading operations where the accuracy tolerance is very tight.