Sector of a sphere

Sector of a sphere
Sector Sec"tor, n. [L., properly, a cutter, fr. secare, sectum, to cut: cf. F. secteur. See {Section}.] 1. (Geom.) A part of a circle comprehended between two radii and the included arc. [1913 Webster]

2. A mathematical instrument, consisting of two rulers connected at one end by a joint, each arm marked with several scales, as of equal parts, chords, sines, tangents, etc., one scale of each kind on each arm, and all on lines radiating from the common center of motion. The sector is used for plotting, etc., to any scale. [1913 Webster]

3. An astronomical instrument, the limb of which embraces a small portion only of a circle, used for measuring differences of declination too great for the compass of a micrometer. When it is used for measuring zenith distances of stars, it is called a zenith sector. [1913 Webster]

{Dip sector}, an instrument used for measuring the dip of the horizon.

{Sector of a sphere}, or {Spherical sector}, the solid generated by the revolution of the sector of a circle about one of its radii, or, more rarely, about any straight line drawn in the plane of the sector through its vertex. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • sector of a sphere — the solid generated by the revolution of the sector of a circle about one of its radii …   Useful english dictionary

  • Sector — Sec tor, n. [L., properly, a cutter, fr. secare, sectum, to cut: cf. F. secteur. See {Section}.] 1. (Geom.) A part of a circle comprehended between two radii and the included arc. [1913 Webster] 2. A mathematical instrument, consisting of two… …   The Collaborative International Dictionary of English

  • sector — ► NOUN 1) an area or portion that is distinct from others. 2) a distinct part of an economy, society, or sphere of activity. 3) a subdivision of an area for military operations. 4) the plane figure enclosed by two radii of a circle or ellipse and …   English terms dictionary

  • Sphere Project — The Sphere Project [ [http://www.sphereproject.org/| Sphere Project] ] was launched in 1997 to develop a set of minimum standards in core areas of humanitarian assistance. The aim of the project is to improve the quality of assistance provided to …   Wikipedia

  • Sphere sovereignty — In Neo Calvinism, sphere sovereignty (Dutch: souvereinitet in eigen kring ) is the concept that each sphere (or sector) of life has its own distinct responsibilities and authority or competence, and stands equal to other spheres of life. Sphere… …   Wikipedia

  • Dip sector — Sector Sec tor, n. [L., properly, a cutter, fr. secare, sectum, to cut: cf. F. secteur. See {Section}.] 1. (Geom.) A part of a circle comprehended between two radii and the included arc. [1913 Webster] 2. A mathematical instrument, consisting of… …   The Collaborative International Dictionary of English

  • Spherical sector — Sector Sec tor, n. [L., properly, a cutter, fr. secare, sectum, to cut: cf. F. secteur. See {Section}.] 1. (Geom.) A part of a circle comprehended between two radii and the included arc. [1913 Webster] 2. A mathematical instrument, consisting of… …   The Collaborative International Dictionary of English

  • sphere — noun /sfɪə,sfɪr/ a) A regular three dimensional object in which every cross section is a circle; the figure described by the revolution of a circle about its diameter . Though cold and darkness longer hang somewhere, / Yet Phoebus equally lights… …   Wiktionary

  • sector — adjective 1) every sector of the industry is affected Syn: part, branch, arm, division, area, department, field, sphere 2) the northeastern sector of the town Syn: district, quarter, part …   Thesaurus of popular words

  • sector — noun 1) every sector of the industry Syn: part, branch, arm, division, area, department, field, sphere 2) the north eastern sector of the town Syn: district, quarter, section …   Synonyms and antonyms dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”