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seconds of arc

См. также в других словарях:

  • arc — I. noun Etymology: Middle English ark, from Anglo French arc bow, from Latin arcus bow, arch, arc more at arrow Date: 14th century 1. the apparent path described above and below the horizon by a celestial body (as the sun) 2. a. something arched… …   New Collegiate Dictionary

  • Arc eye — DiseaseDisorder infobox Name = Arc eye Latin = Photokeratitis ICD10 = ICD10|H|16|1|h|15 ICD9 = ICD9|370.24Arc eye, also known as welder s flash, bake eyes, corneal flash burns, or flash burns, is a painful ocular condition sometimes experienced… …   Wikipedia

  • 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

  • Cross-dressing, sexuality, and gender identity of Joan of Arc — Emmanuel Frémiet s statue of Joan of Arc, in military attire, stands outside Place des Pyramides, Paris. Joan of Arc (Fr: Jeanne d Arc), a French revolutionary executed by the English for heresy in 1431, is a national heroine of France and a… …   Wikipedia

  • Deuterium arc lamp — A deuterium arc lamp (or simply deuterium lamp) is a low pressure gas discharge light source often used in spectroscopy when a continuous spectrum in the ultraviolet region is needed. Contents 1 Principle of operation 2 Deuterium lamp spectra 3… …   Wikipedia

  • eye, human — ▪ anatomy Introduction  specialized sense organ capable of receiving visual images, which are then carried to the brain. Anatomy of the visual apparatus Structures auxiliary to the eye The orbit       The eye is protected from mechanical injury… …   Universalium

  • Visual acuity — 20/15 and 20/15 vision redirect here. For other uses, see 2020 (disambiguation). Typical Snellen chart used for visual acuity testing. Visual acuity (VA) is acuteness or clearness of vision, which is dependent on the sharpness of the retinal… …   Wikipedia

  • star — starless, adj. /stahr/, n., adj., v., starred, starring. n. 1. any of the heavenly bodies, except the moon, appearing as fixed luminous points in the sky at night. 2. Astron. any of the large, self luminous, heavenly bodies, as the sun, Polaris,… …   Universalium

  • Angular diameter — The angular diameter or apparent size of an object as seen from a given position is the “visual diameter” of the object measured as an angle. In the vision sciences it is called the visual angle. The visual diameter is the diameter of the… …   Wikipedia

  • telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… …   Universalium

  • parallax — parallactic /par euh lak tik/, adj. parallactically, adv. /par euh laks /, n. 1. the apparent displacement of an observed object due to a change in the position of the observer. 2. Astron. the apparent angular displacement of a celestial body due …   Universalium

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