Diurnal acceleration of the fixed stars
Acceleration Ac*cel`er*a"tion, n. [L. acceleratio: cf. F. acc['e]l['e]ration.] The act of accelerating, or the state of being accelerated; increase of motion or action; as, a falling body moves toward the earth with an acceleration of velocity; -- opposed to {retardation}. [1913 Webster]

A period of social improvement, or of intellectual advancement, contains within itself a principle of acceleration. --I. Taylor. [1913 Webster] (Astr. & Physics.)

{Acceleration of the moon}, the increase of the moon's mean motion in its orbit, in consequence of which its period of revolution is now shorter than in ancient times.

{Acceleration} and {retardation of the tides}. See {Priming of the tides}, under {Priming}.

{Diurnal acceleration of the fixed stars}, the amount by which their apparent diurnal motion exceeds that of the sun, in consequence of which they daily come to the meridian of any place about three minutes fifty-six seconds of solar time earlier than on the day preceding.

{Acceleration of the planets}, the increasing velocity of their motion, in proceeding from the apogee to the perigee of their orbits. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Acceleration of the moon — Acceleration Ac*cel er*a tion, n. [L. acceleratio: cf. F. acc[ e]l[ e]ration.] The act of accelerating, or the state of being accelerated; increase of motion or action; as, a falling body moves toward the earth with an acceleration of velocity;… …   The Collaborative International Dictionary of English

  • Acceleration of the planets — Acceleration Ac*cel er*a tion, n. [L. acceleratio: cf. F. acc[ e]l[ e]ration.] The act of accelerating, or the state of being accelerated; increase of motion or action; as, a falling body moves toward the earth with an acceleration of velocity;… …   The Collaborative International Dictionary of English

  • retardation of the tides — Acceleration Ac*cel er*a tion, n. [L. acceleratio: cf. F. acc[ e]l[ e]ration.] The act of accelerating, or the state of being accelerated; increase of motion or action; as, a falling body moves toward the earth with an acceleration of velocity;… …   The Collaborative International Dictionary of English

  • Orbit of the Moon — Not to be confused with Lunar orbit in the sense of a selenocentric orbit, that is, an orbit around the Moon The Moon completes its orbit around the Earth in approximately 27.3 days (a sidereal month). The Earth and Moon orbit about their… …   Wikipedia

  • Acceleration — Ac*cel er*a tion, n. [L. acceleratio: cf. F. acc[ e]l[ e]ration.] The act of accelerating, or the state of being accelerated; increase of motion or action; as, a falling body moves toward the earth with an acceleration of velocity; opposed to… …   The Collaborative International Dictionary of English

  • Acceleration — Ac*cel er*a tion, n. [L. acceleratio: cf. F. acc[ e]l[ e]ration.] The act of accelerating, or the state of being accelerated; increase of motion or action; as, a falling body moves toward the earth with an acceleration of velocity; opposed to… …   The Collaborative International Dictionary of English

  • History of Physics —     History of Physics     † Catholic Encyclopedia ► History of Physics     The subject will be treated under the following heads: I. A Glance at Ancient Physics; II. Science and Early Christian Scholars; III. A Glance at Arabian Physics; IV.… …   Catholic encyclopedia

  • Science and mathematics from the Renaissance to Descartes — George Molland Early in the nineteenth century John Playfair wrote for the Encyclopaedia Britannica a long article entitled ‘Dissertation; exhibiting a General View of the Progress of Mathematics and Physical Science, since the Revival of Letters …   History of philosophy

  • Solar time — On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant …   Wikipedia

  • gravitation — gravitational, adj. gravitationally, adv. /grav i tay sheuhn/, n. 1. Physics. a. the force of attraction between any two masses. Cf. law of gravitation. b. an act or process caused by this force. 2. a sinking or falling …   Universalium

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