nutation period

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• Nutation — See also: Nutation in plants Rotation (green), Precession (blue) and Nutation in obliquity (red) of the Earth Nutation (from Latin: nūtāre, to nod) is a rocking, swaying, or nodding motion in the axis of rotation of a largely axially symmetric… …   Wikipedia

• nutation — nutational, adj. /nooh tay sheuhn, nyooh /, n. 1. an act or instance of nodding one s head, esp. involuntarily or spasmodically. 2. Bot. spontaneous movements of plant parts during growth. 3. Astron. the periodic oscillation observed in the… …   Universalium

• Tide — This article is about tides in the Earth s oceans. For other uses, see Tide (disambiguation). Tidal redirects here. For other uses, see Tidal (disambiguation). High Tide redirects here. For other uses, see High Tide (disambiguation) …   Wikipedia

• mechanics — /meuh kan iks/, n. 1. (used with a sing. v.) the branch of physics that deals with the action of forces on bodies and with motion, comprised of kinetics, statics, and kinematics. 2. (used with a sing. v.) the theoretical and practical application …   Universalium

• 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

• Chandler wobble — The Chandler wobble is a small motion in the Earth s axis of rotation relative to the Earth s surface, which was discovered by American astronomer Seth Carlo Chandler in 1891. It amounts to 9 metres (30 ft)[citation needed] on the Earth s… …   Wikipedia

• Axial tilt — Obliquity redirects here. For the book, see Obliquity (book). To understand axial tilt, consider this blue solenoid in right hand grip rule as the rotational axis of Earth, the counter clockwise direction of the magnetic field as the orbital… …   Wikipedia

• Earth's rotation — is the rotation of the solid Earth around its own axis. The Earth rotates towards the east, which can be observed by orientation with a magnetic compass at sunrise. As viewed from the star Polaris, the Earth turns counter clockwise. Rotation… …   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

• Tropical year — A tropical year (also known as a solar year), for general purposes, is the length of time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox,… …   Wikipedia

• Sacroiliac joint — Infobox Anatomy Name = Sacroiliac joint Latin = articulatio sacroiliaca GraySubject = 80 GrayPage = 306 Caption = Articulations of pelvis. Anterior view. Caption2 = Articulations of pelvis. Posterior view. System = MeshName = MeshNumber =… …   Wikipedia