Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
unit ofangle ; 1/60th of anarcminute , or 1/3600th of adegree .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a 60th part of a minute of arc
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
Examples
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See, I'm just biased towards interferometers; -) ** One arcsecond is 1/60th of an arcminute, and one arcminute is 1/60th of a degree.
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See, I'm just biased towards interferometers; -) ** One arcsecond is 1/60th of an arcminute, and one arcminute is 1/60th of a degree.
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Whereas ground-based optical telescopes have sub-arcsecond** resolution, and Hubble is quoted as having a resolution of 0.085 arcseconds, single-dish radio telescopes can only get resolutions of a few arcminutes.
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The Very Long Baseline Array, stretching from Hawaii to the Caribbean, regularly produces images with milli-arcsecond resolution.
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Whereas ground-based optical telescopes have sub-arcsecond** resolution, and Hubble is quoted as having a resolution of 0.085 arcseconds, single-dish radio telescopes can only get resolutions of a few arcminutes.
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The Very Long Baseline Array, stretching from Hawaii to the Caribbean, regularly produces images with milli-arcsecond resolution.
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In astronomy, the preferred unit of measurement for such distances is the parsec, which is defined as the distance at which an object will appear to move one arcsecond of parallax when the observer moves one astronomical unit perpendicular to the line of sight to the observer.
Ann Aguirre » Blog Archive » A day in the life – blog Jeopardy
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To image something green on the sky to 1 arcsecond (which optical telescopes routinely do) thus requires a telescope of size at least 10 cm.
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Quite nice, with image/elevation data of the world down to 1 arcsecond.
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The parsec in turn is defined to be a certain multiple of the astronomical unit original such that the parallax of a star as it appears from the Earth is 1 arcsecond.
Comments
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