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Related to Arc seconds: Milliarcsecond

SECOND. A measure equal to one sixtieth part of a minute. Vide Measure.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
Remember that we multiplied the Arc Seconds at 600 x 60 (see sidebar) because we were using the spotting scope on 60X.
Its three rotating laser planes are perpendicular to 2 arc seconds and flat to 2 arc seconds in a 180-degree sweep.
Higher power reveals the magnitude 10 central star quite well, although it is not the one which is illuminating the nebula; that honour belongs to a magnitude 16 dwarf companion, 1.65 arc seconds away.
The satellite can map extended objects and locate point sources to within a few arc seconds. It can also provide spectral information to determine the temperature, density, and chemical abundances of the emitting gas."
This results in an angular resolution of 0.0003 arc seconds. Calibration and compensation of systematic errors bring a system accuracy of 0.06 arc seconds over 13.2[degrees].
* Digital Display in Arc Seconds, Inches/10" or mm/M.
Other near-misses include Arc seconds for 1990 Niel winner Epervier Bleu and for the Group 1 Prix Vermeille scorers Magic Night (1991) and Leggera (1998).
Only one of the two quasars, which are 4.2 arc seconds apart, registers in radio wavelengths, while both can be seen in the visible range.
The 360,000-position NC table offers an indexing accuracy of [+ or -]7 arc seconds and an indexing repeatability of [+ or -]3.5 arc seconds.
But they remain intrigued by the Cape observations of 1862, which are internally consistent and show the comet drifting in the sky southwest of its nominal path by 10 arc seconds at the start of October to nearly 18 arc seconds at the end.