precessional constant

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• constant of nutation — the amplitude of the celestial latitude component of the precessional nutation of the earth s axis that is equal to about 9.2 seconds of arc compare nutation 2 …   Useful english dictionary

• Precession (astronomy) — In astronomy, precession refers to the movement of the rotational axis of a body, such as a planet, with respect to inertial space. In particular, it refers to the precession of the Earth s rotational axis, also called the precession of the… …   Wikipedia

• Precession — For other uses, see Precession (disambiguation). Precession of a gyroscope Precession is a change in the orientation of the rotation axis of a rotating body. It can be defined as a change in direction of the rotation axis in which the second… …   Wikipedia

• Hindu chronology — The subject of Hindu chronology divides naturally into three parts: the calendar, the eras, and other reckonings. The Calendar The Hindus have had, from very ancient times, the system of lunisolar cycles, made by the combination of solar years,… …   Wikipedia

• Vanguard 3 — or Vanguard III was launched by a Vanguard rocket on Sep. 18, 1959, the third successful Vanguard launch out of eleven attempts. Mission ObjectivesThe satellite was launched from the Eastern Test Range into a geocentric orbit. The objectives of… …   Wikipedia

• Landau–Lifshitz–Gilbert equation — In physics, the Landau Lifshitz Gilbert equation , named for Lev Landau and Evgeny Lifshitz and T. L. Gilbert, is a name used for a differential equation describing the precessional motion of magnetization M in a solid. It is a modification by… …   Wikipedia

• Great year — A Great year (also known as a Platonic year or Equinoctial cycle) is the time required for one complete cycle of the precession of the equinoxes, about 25,765 years, at the current rate. Astrologers consider it important, while modern day… …   Wikipedia

• Magnonics — is an emerging field of modern magnetism, which can be considered a sub field of modern solid state physics.[1] Magnonics combines waves and magnetism, its main aim is to investigate the behaviour of spin waves in nano structure elements. In… …   Wikipedia

• Thomas precession — In physics the Thomas precession, named after Llewellyn Thomas, is a special relativistic correction to the precession of a gyroscope in a rotating non inertial frame. It can be understood as a consequence of the fact that the space of velocities …   Wikipedia

• North America — North American. the northern continent of the Western Hemisphere, extending from Central America to the Arctic Ocean. Highest point, Mt. McKinley, 20,300 ft. (6187 m); lowest, Death Valley, 276 ft. (84 m) below sea level. 400,000,000 including… …   Universalium

• frequency — The number of regular recurrences in a given time, e.g., heartbeats, sound vibrations. [L. frequens, repeated, often, constant] best f. SYN: characteristic f.. characteristic f. f. at which a given neuron responds to the least sound intensity.… …   Medical dictionary