apparent diameter
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:

• apparent diameter — apparent diameter, the diameter of a heavenly body as it appears to the observer; angle subtended by the diameter of a heavenly body at the eye of the viewer; angular diameter …   Useful english dictionary

• apparent diameter — kampinis skersmuo statusas T sritis fizika atitikmenys: angl. angular diameter; apparent diameter vok. scheinbare Durchmesser, m; Winkeldurchmesser, m rus. видимый диаметр, m; угловой диаметр, m pranc. diamètre angulaire, m; diamètre apparent, m …   Fizikos terminų žodynas

• Apparent magnitude — Asteroid 65 Cybele and 2 stars with their magnitudes labeled The apparent magnitude (m) of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere.… …   Wikipedia

• Apparent 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… …   The Collaborative International Dictionary of English

• apparent 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… …   The Collaborative International Dictionary of English

• Apparent — Ap*par ent, a. [F. apparent, L. apparens, entis, p. pr. of apparere. See {Appear}.] 1. Capable of being seen, or easily seen; open to view; visible to the eye; within sight or view. [1913 Webster] The moon . . . apparent queen. Milton. [1913… …   The Collaborative International Dictionary of English

• Apparent horizon — Apparent Ap*par ent, a. [F. apparent, L. apparens, entis, p. pr. of apparere. See {Appear}.] 1. Capable of being seen, or easily seen; open to view; visible to the eye; within sight or view. [1913 Webster] The moon . . . apparent queen. Milton.… …   The Collaborative International Dictionary of English

• Apparent time — Apparent Ap*par ent, a. [F. apparent, L. apparens, entis, p. pr. of apparere. See {Appear}.] 1. Capable of being seen, or easily seen; open to view; visible to the eye; within sight or view. [1913 Webster] The moon . . . apparent queen. Milton.… …   The Collaborative International Dictionary of English

• 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

• angular diameter — kampinis skersmuo statusas T sritis fizika atitikmenys: angl. angular diameter; apparent diameter vok. scheinbare Durchmesser, m; Winkeldurchmesser, m rus. видимый диаметр, m; угловой диаметр, m pranc. diamètre angulaire, m; diamètre apparent, m …   Fizikos terminų žodynas