Second

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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.
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As an extension of the VLT, the West German report proposes a 1-kilometerlong array of six to 12 telescopes that would be capable of resolving detail in visible light to one ten-thousandth of a second of arc, which is as well as radio VLBI now does.
Astronomy in West Germany goes supernational: the science of astronomy virtually demands international cooperation
"The diameter of the star was found to be 0.0068 [+ or -] 0.0005 second of arc, agreeing well with the angular diameter of 0.0063 second computed from the known surface temperature and brightness of Sirius."
50 & 25 years ago
The MMT can point to within 0.3 second of a arc, it can track objects across the sky to an accuracy of 0.1 second of arc, and after a great deal of work, its images can be coaligned and made to coincide as well as astronomers would like.
New telescope for old

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