proper sphere
1Sphere — Sphere, n. [OE. spere, OF. espere, F. sph[ e]re, L. sphaera,. Gr. ??? a sphere, a ball.] 1. (Geom.) A body or space contained under a single surface, which in every part is equally distant from a point within called its center. [1913 Webster] 2.… …
2sphere´like´ — sphere «sfihr», noun, verb, sphered, spher|ing. –n. 1. a) a round body whose surface is at all points equally distant from the center. b) any rounded body approximately of this form; ball; globe. A baseball is a sphere. 2. one of the stars or… …
3sphere´less — sphere «sfihr», noun, verb, sphered, spher|ing. –n. 1. a) a round body whose surface is at all points equally distant from the center. b) any rounded body approximately of this form; ball; globe. A baseball is a sphere. 2. one of the stars or… …
4Proper motion — The proper motion of a star is its angular change in position over time as seen from the center of mass of the solar system.[1] It is measured in seconds of arc per year, arcsec/yr, where 3600 arcseconds equal one degree.[2] This contrasts with… …
5Sphere (disambiguation) — A sphere is an object shaped like the surface of a ball, but can be used to refer to a ball shaped object, as well as a sphere like or annular region or shell. Additionally, it has several metaphorical uses.In mathematics: * Sphere, the set of… …
6proper motion — Astron. the angular motion of a star relative to a suitably defined frame of reference, expressed in seconds of arc per year. Cf. tangential motion. [1595 1605] * * * Apparent motion of a star across the celestial sphere at right angles to the… …
7Proper time — In relativity, proper time is time measured by a single clock between events that occur at the same place as the clock. It depends not only on the events but also on the motion of the clock between the events. An accelerated clock will measure a… …
8sphere — I. noun Etymology: Middle English spere globe, celestial sphere, from Anglo French espere, from Latin sphaera, from Greek sphaira, literally, ball; perhaps akin to Greek spairein to quiver more at spurn Date: 14th century 1. a. (1) the apparent… …
9proper motion — noun : the apparent change in position of a star usually expressed in seconds of arc per year that results from the projection on the celestial sphere of its motion with respect to the solar system see tangential motion …
10Armillary sphere — Sphere Sphere, n. [OE. spere, OF. espere, F. sph[ e]re, L. sphaera,. Gr. ??? a sphere, a ball.] 1. (Geom.) A body or space contained under a single surface, which in every part is equally distant from a point within called its center. [1913… …
