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See also:ECCENTRIC (from Gr. F,c, out of, and Kivrpov, centre) , literally " out from the centre," and thus used to connote generally any deviation from the normal . In See also:astronomy the word denotes a circle See also:round which a See also:body revolves, but whose centre is displaced from the visible centre of See also:motion . In the See also:ancient astronomy the ellipses in which it is now known that the See also:planets revolve around the See also:sun could not be distinguished from circles, but the unequal angular motion due to See also:ellipticity was observed . The theory of the See also:eccentric was that the centre of the See also:epicycle of each See also:planet moved uniformly in a circle, the centre of which was displaced from that of the See also:earth by an amount See also:double the eccentricity of the actual See also:ellipse, as the See also:case is now understood . When measured around this imaginary centre, which is so situated on the See also:major See also:axis of the ellipse that the See also:focus, or See also:place of the real sun, is midway between it and the centre of the ellipse, the motion is approximately See also:uniform . In See also:engineering, an eccentric is a See also:mechanical See also:device for converting rotary into reciprocating motion (see See also:STEAM-See also:ENGINE) . For eccentric See also:angle see ELLIPSE . |
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[back] ECCELINO [or EzzELINO] DA ROMANO (1194-1259) |
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