Think for thyself one good idea, but known to be thine own, is better than a thousand gleaned from fields by others sown.Alexander Wilson
From Old French espere, from late [[w:Template:lang:la language|Template:lang:la]][[Category:Template:lang:la derivations]] sphēra, earlier sphaera (“‘ball, globe, celestial sphere’”), from Ancient Greek σφαῖρα (“‘ball, globe’”), of unknown origin.
- (geometry)A regular three-dimensional object in which every cross-section is a circle; the figure described by the revolution of a semi-circle about its diameter.
- (mathematics) The set of all points in three-dimensional Euclidean space (or n.-dimensional space, in topology) that are a fixed distance from a fixed point.
- A spherical object; a globe or ball.
- The apparent outer limit of space, the edge of the heavens, imagined as a hollow globe within which celestial bodies appear to be embedded.
- (historical, astronomy) Any of the concentric hollow transparent globes formerly believed to rotate around the Earth, and which carried the heavenly bodies; there were originally believed to be eight, and later nine and ten; friction between them was thought to cause a harmonious sound (the music of the spheres).
- 1603, John Florio, translating Michel de Montaigne, Essays, vol. 1 p. 153:
- It is more simplicitie to teach our children [...] [t]he knowledge of the starres, and the motion of the eighth spheare, before their owne.
- (figuratively) An area of activity for a planet; or by extension, an area of influence for a god, hero etc.
- The region in which something or someone is active; one's province, domain.
astronomy: apparent surface of the heavens
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