visual magnitude
Magnitude Mag"ni*tude, n. [L. magnitudo, from magnus great. See {Master}, and cf. {Maxim}.] 1. Extent of dimensions; size; -- applied to things that have length, breadth, and thickness. [1913 Webster]

Conceive those particles of bodies to be so disposed amongst themselves, that the intervals of empty spaces between them may be equal in magnitude to them all. --Sir I. Newton. [1913 Webster]

2. (Geom.) That which has one or more of the three dimensions, length, breadth, and thickness. [1913 Webster]

3. Anything of which greater or less can be predicated, as time, weight, force, and the like. [1913 Webster]

4. Greatness; grandeur. ``With plain, heroic magnitude of mind.'' --Milton. [1913 Webster]

5. Greatness, in reference to influence or effect; importance; as, an affair of magnitude. [1913 Webster]

The magnitude of his designs. --Bp. Horsley. [1913 Webster]

6. (Astron.) See {magnitude of a star}, below. [PJC]

{Apparent magnitude}

1. (Opt.), the angular breadth of an object viewed as measured by the angle which it subtends at the eye of the observer; -- called also {apparent diameter}.

2. (Astron.) Same as {magnitude of a star}, below.

{Magnitude of a star} (Astron.), the rank of a star with respect to brightness. About twenty very bright stars are said to be of first magnitude, the stars of the sixth magnitude being just visible to the naked eye; called also {visual magnitude}, {apparent magnitude}, and simply {magnitude}. Stars observable only in the telescope are classified down to below the twelfth magnitude. The difference in actual brightness between magnitudes is now specified as a factor of 2.512, i.e. the difference in brightness is 100 for stars differing by five magnitudes. [1913 Webster +PJC]

The Collaborative International Dictionary of English. 2000.

### Look at other dictionaries:

• visual magnitude — Astron. magnitude (def. 5a). * * * …   Universalium

• visual magnitude — noun : the brightness of a celestial body determined by eye estimation with or without optical aid or by other instrumentation equivalent to the eye in spectral sensitivity * * * Astron. magnitude (def. 5a) …   Useful english dictionary

• Magnitude — Mag ni*tude, n. [L. magnitudo, from magnus great. See {Master}, and cf. {Maxim}.] 1. Extent of dimensions; size; applied to things that have length, breadth, and thickness. [1913 Webster] Conceive those particles of bodies to be so disposed… …   The Collaborative International Dictionary of English

• magnitude — Mag ni*tude, n. [L. magnitudo, from magnus great. See {Master}, and cf. {Maxim}.] 1. Extent of dimensions; size; applied to things that have length, breadth, and thickness. [1913 Webster] Conceive those particles of bodies to be so disposed… …   The Collaborative International Dictionary of English

• Magnitude of a star — Magnitude Mag ni*tude, n. [L. magnitudo, from magnus great. See {Master}, and cf. {Maxim}.] 1. Extent of dimensions; size; applied to things that have length, breadth, and thickness. [1913 Webster] Conceive those particles of bodies to be so… …   The Collaborative International Dictionary of English

• magnitude — magnitudinous /mag ni toohd n euhs, tyoohd /, adj. /mag ni toohd , tyoohd /, n. 1. size; extent; dimensions: to determine the magnitude of an angle. 2. great importance or consequence: affairs of magnitude. 3. greatness of size or amount. 4.… …   Universalium

• Magnitude (astronomy) — For other uses, see Magnitude (disambiguation). Magnitude is the logarithmic measure of the brightness of an object, in astronomy, measured in a specific wavelength or passband, usually in optical or near infrared wavelengths. Contents 1… …   Wikipedia

• Visual kei — Направление: J Rock Истоки: глэм метал поп панк готик рок электронная музыка Место и время возникновения: 1982 1985 …   Википедия

• Visual Angle Illusion — The visual angle, V degrees, subtended by a viewed object sometimes looks larger or smaller than its actual value, creating a visual angle illusion (V illusion).These V illusions have been explicitly described by many vision researchers,… …   Wikipedia

• Visual search — In theory of cognition, visual search is a type of perceptual task requiring attention. Visual search involves an active scan of the visual environment for a particular object or feature (the target) among other objects or features (the… …   Wikipedia