(in visual photometry)
21субъективная фотометрия — vizualioji fotometrija statusas T sritis fizika atitikmenys: angl. subjective photometry; visual photometry vok. subjektive Photometrie, f; visuelle Photometrie, f rus. визуальная фотометрия, f; субъективная фотометрия, f pranc. photométrie… …
22UBV — Universidad Bolivariana de Venezuela (Academic & Science » Universities) * Ultrasound Bone Velocity (Medical » Physiology) * Uniao Brasileira de Veleiros (Community » Sports) * Upper Bound Value (Academic & Science » Mathematics) * Utrecht… …
23argelander's method — ˈärgəˌlandərz , län noun Usage: capitalized A Etymology: after F.W.A. Argelander died 1875 German astronomer : a method of visual photometry that determines the magnitude of a star or the extent of changes in brightness of a variable star by… …
24Lux — For other uses, see Lux (disambiguation). A lux meter for measuring illuminances in work places. The lux (symbol: lx) is the SI unit of illuminance and luminous emittance measuring luminous power per area. It is used in photometry as a measure of …
25Light — For other uses, see Light (disambiguation). Visible light redirects here. For other uses, see Visible light (disambiguation) …
26Light 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 …
27Mesopic vision — is a combination of photopic vision and scotopic vision in low but not quite dark lighting situations.[1] Mesopic light levels range from luminances of approximately 0.001 to 3 cd m 2. Most night time outdoor and traffic lighting scenarios… …
28Lighting — Not to be confused with lightning. For other uses, see lighting (disambiguation). Low intensity lighting and haze in a concert hall allows laser effects to be visible …
29Exposure (photography) — Underexposure redirects here. For the 2005 film by Oday Rasheed, see Underexposure (2005 film). A long exposure showing stars rotating around the southern and northern celestial poles. Credit: European Southern Observatory …
30University of Illinois Observatory — Infobox nrhp | name = University of Illinois Astronomical Observatory nrhp type=nhl caption = The observatory at U of I is a National Historic Landmark. locator x = locator y = location = Urbana, Illinois, Champaign County, Illinois, USA nearest… …
