Keplerianadj.

Brit.

/kɛˈplɪərɪən/, U.S.

/kɛˈplɛriən/

Etymology: < Kepler n. + -ian suffix.

Of or pertaining to Kepler or his discoveries and investigations; applied spec. to (a) motion, orbits, and trajectories such as occur when one body moves freely in the gravitational field of another (much more massive) body, viz. an ellipse (in accordance with Kepler's laws) or some other conic section; (b) a refracting telescope that has a positive objective and a positive eyepiece and gives an inverted image.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [adjective] > telescope > other telescopes

Galilean1728

dialytic1839

coudé1888

autocollimating1898

Keplerian1909

double-barrelled1955

Dobsonian1980

1851 J. S. Mill Syst. Logic (ed. 3) I. iii. ii. 313 If the Keplerian operation, as a logical process, be really identical with what takes place in acknowledged induction, the definition of induction ought to be so widened as to take it in.

1909 Webster's New Internat. Dict. Eng. Lang. Keplerian telescope.

1922 A. D. Udden tr. N. Bohr Theory of Spectra ii. 37 The orbit of the electron deviates a little from a simple ellipse and is no longer exactly periodic. This deviation from a Keplerian motion is, however, very small compared with the perturbations due to the presence of external forces.

1935 E. A. Milne Relativity, Gravitation & World-struct. xiv. 267 Newton..determined the nature of the possible motions of the particle and showed that it consisted of Keplerian orbits, or parabolas or hyperbolas with Keplerian properties.

1935 E. A. Milne Relativity, Gravitation & World-struct. xiv. 267 Newton's solution of the Keplerian problem.

1958 Listener 20 Nov. 839/1 The Keplerian universe, which did away with the epicycles, was systematically ignored by Galileo.

1959 K. A. Ehricke in H. S. Seifert Space Technol. viii. 92 Figure 8–50 presents a survey of possible Keplerian (in distinction to powered) mission profiles for the inner and outer solar system.

1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) VII. 452/2 If the second lens has a positive power, the telescope is called a..Keplerian telescope and the separation of the two parts is equal to the sum of the focal lengths.

1966 Daily Tel. 31 Oct. 9/8 True weightlessness..can best be simulated in an aircraft flying in a so-called Keplerian trajectory.

1968 R. A. Lyttleton Myst. Solar Syst. iv. 124 It is to be remembered that in computing an orbit, the aim is to obtain a Keplerian path about the sun—an ellipse, parabola, or hyperbola—that fits the observation.

This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2022).

单词	keplerian
释义	Keplerianadj. Brit. /kɛˈplɪərɪən/, U.S. /kɛˈplɛriən/ Etymology: < Kepler n. + -ian suffix. Of or pertaining to Kepler or his discoveries and investigations; applied spec. to (a) motion, orbits, and trajectories such as occur when one body moves freely in the gravitational field of another (much more massive) body, viz. an ellipse (in accordance with Kepler's laws) or some other conic section; (b) a refracting telescope that has a positive objective and a positive eyepiece and gives an inverted image. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [adjective] > telescope > other telescopes Galilean1728 dialytic1839 coudé1888 autocollimating1898 Keplerian1909 double-barrelled1955 Dobsonian1980 1851 J. S. Mill Syst. Logic (ed. 3) I. iii. ii. 313 If the Keplerian operation, as a logical process, be really identical with what takes place in acknowledged induction, the definition of induction ought to be so widened as to take it in. 1909 Webster's New Internat. Dict. Eng. Lang. Keplerian telescope. 1922 A. D. Udden tr. N. Bohr Theory of Spectra ii. 37 The orbit of the electron deviates a little from a simple ellipse and is no longer exactly periodic. This deviation from a Keplerian motion is, however, very small compared with the perturbations due to the presence of external forces. 1935 E. A. Milne Relativity, Gravitation & World-struct. xiv. 267 Newton..determined the nature of the possible motions of the particle and showed that it consisted of Keplerian orbits, or parabolas or hyperbolas with Keplerian properties. 1935 E. A. Milne Relativity, Gravitation & World-struct. xiv. 267 Newton's solution of the Keplerian problem. 1958 Listener 20 Nov. 839/1 The Keplerian universe, which did away with the epicycles, was systematically ignored by Galileo. 1959 K. A. Ehricke in H. S. Seifert Space Technol. viii. 92 Figure 8–50 presents a survey of possible Keplerian (in distinction to powered) mission profiles for the inner and outer solar system. 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) VII. 452/2 If the second lens has a positive power, the telescope is called a..Keplerian telescope and the separation of the two parts is equal to the sum of the focal lengths. 1966 Daily Tel. 31 Oct. 9/8 True weightlessness..can best be simulated in an aircraft flying in a so-called Keplerian trajectory. 1968 R. A. Lyttleton Myst. Solar Syst. iv. 124 It is to be remembered that in computing an orbit, the aim is to obtain a Keplerian path about the sun—an ellipse, parabola, or hyperbola—that fits the observation. This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2022). < adj.1851
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