apsides

• “(Newton must have been mystified by the failure of his seemingly parallel derivation of the 9 year precession of the line of apsides to achieve better than 50 percent agreement.)”

  Newton's Philosophiae Naturalis Principia Mathematica

• “Nobody could ascertain the exact purpose of the set of maneuvers; they were just "orientation changes," according to the Earth scientists, that had altered the inclination and line of apsides of the Rama orbit.”

  Rama Revisited

• “Any persons whom it could please have no better notion of what the words referred to signify than of the meaning of _apsides_ and”

  The Atlantic Monthly, Volume 03, No. 20, June, 1859

• “But far older than even these are the colossal grim circles of saints and apostles who cling to the roof of the choir, and yield in size only to the awful figures of the Saviour, the Virgin, and Saint Paul, enthroned in the _apsides_ of the nave and aisles.”

  The Atlantic Monthly, Volume 06, No. 34, August, 1860

• “Prior to the discovery of those laws the Sun, though acknowledged to be the centre of the system, did not appear to occupy a central position as regards the motions of the planets; but Kepler, by demonstrating that the planes of the orbits of all the planets, and the lines connecting their apsides, passed through the Sun, was enabled to assign the orb his true position with regard to those bodies.”

  The Astronomy of Milton's 'Paradise Lost'

• “Horrox as depending upon the libratory motion of the apsides, and the change which takes place in the eccentricity of the lunar orbit.”

  The Astronomy of Milton's 'Paradise Lost'

• “And, we might also ask, why the tangential resistance to the comet of Encke should not also produce a retrograde motion in the apsides of the orbit, instead of diminishing its period?”

  Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence

• “At the perihelion this excess of tangential velocity creates a resistance, which urges the planet towards the sun, and at the aphelion, the deficiency of tangential velocity urges the planet from the sun, -- the maximum effect being at the apsides of the orbit, and null at the mean distances.”

  Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence

• “This proportion of the decrement of the forces is confirmed from the eccentricity of the planets, and the very slow motion of their apsides; for in no other proportion, it has been established, could the circum-solar planets once in every revolution descend to their least, and once ascend to their greatest distance from the sun, and the places of those distances remain immovable.”

  The World's Greatest Books — Volume 15 — Science

• “A small error from the duplicate proportion would produce a motion of the apsides considerable in every revolution, but in many enormous.”

  The World's Greatest Books — Volume 15 — Science

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