arcsecond
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arcsecond — (″ or as or sec or s) a unit of angular measure, also called the second of arc, equal to 1/60 arcminute. One arcsecond is a very small angle indeed: there are 1 296 000 seconds in a circle. The SI defines s as the symbol for the time unit and… … Dictionary of units of measurement
Arcsecond — … Википедия
arcsecond — noun a 60th part of a minute of arc the treasure is 2 minutes and 45 seconds south of here • Syn: ↑second • Hypernyms: ↑angular unit • Part Holonyms: ↑minute, ↑arcminute, ↑ … Useful english dictionary
Minute of arc — This article is about geometry. For firearms terminology, see Minute of Angle. A minute of arc, arcminute, or minute of angle (MOA), is a unit of angular measurement equal to one sixtieth (1⁄60) of one degree. In turn, a second of arc or… … Wikipedia
Parsec — For other uses, see Parsec (disambiguation). 1 parsec = SI units 30.857×10^12 km 30.857×10^15 m Astronomical units 206.26× … Wikipedia
Beta Tucanae — Starbox short name=β¹,² Tucanae epoch=J2000.0 constell=Tucana ra=00h 31m 32.7s dec=−62° 57 29 spectral=AB: A2V+B9V CD: A2V+A7V appmag v=β¹: +4.36 β²: +4.53 dist ly=140 ± 3 dist pc=43 ± 1 names=HR 126 + HR 126, HD 2884 + HD 2885, CP 63 50, HIP… … Wikipedia
parsec — (pc or psc) a non metric unit of distance used in astronomy. As the Earth makes its orbit around the Sun, nearby stars appear to shift their positions in relation to the background of distant stars. This shift, called the parallax of the star … Dictionary of units of measurement
Light pollution — This article is about light pollution in the visible spectrum. For information on pollution in the radio spectrum, see radio spectrum pollution. This time exposure photo of New York City at night shows skyglow, one form of light pollution … Wikipedia
Vega — Starbox begin name=Vega Starbox image caption = Location of Vega in the constellation Lyra. Starbox observe epoch=J2000.0 constell=Lyra ra=RA|18|36|56.3364cite web author=Staff date=October 30, 2007 url=http://simbad.u strasbg.fr/simbad/sim… … Wikipedia
Angular resolution — describes the resolving power of any image forming device such as an optical or radio telescope, a microscope, a camera, or an eye. Definition of terms Resolving power is the ability of the components of an imaging device to measure the angular… … Wikipedia
