# rotation axis

## rotation axis

[rō′tā·shən ‚ak·səs]
(crystallography)
A symmetry element of certain crystals in which the crystal can be brought into a position physically indistinguishable from its original position by a rotation through an angle of 360°/ n about the axis, where n is the multiplicity of the axis, equal to 2, 3, 4, or 6. Also known as symmetry axis.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The tilt of a planet's magnetic field can also be used to get the exact time frame of one spin around its axis,&nbsp;but this could not be applied to Saturn as the gas giant's field aligns nearly perfectly with its rotation axis.
For this reason, the planet's magnetic poles don't align exactly with its geographic ones (which are simply the end points of the Earth's rotation axis), and the location of the poles can change without warning.
The influence of gravity under conditions of horizontal arrangement of SBD rotation axis, decreases tangential component, which moves fluid into the position opposite to imbalance and leads to decreasing of balancing accuracy in comparison with vertical rotation axis.
Because of the very small tilt of the Moon's rotation axis, sunlight never reaches these regions.
Beard, "Attitude regulation about a fixed rotation axis," Journal of Guidance, Control, and Dynamics, vol.
For a spheroid, there are two parameters representing its shape, that is, the aspect ratio and the radius of rotation axis. Here, we use the equal-surface area sphere to represent the spheroid particle, and the equal-surface diameter can be calculated by the spheroid particle.
To allow for a more biological design, the orientation of the rotation axis of the ankle stretching device can be redesigned to align with anatomical ankle joint and also with some floating flexibilities for training comfort and safety.
In case the rotation axis is not parallel to [mathematical expression not reproducible], the projection we of the Earth angular velocity vector on the axis of sensitivity of the angular accelerometer, and hence on its output signal, alternates with the accelerometer rotation, which makes it possible to determine the position of the sensitivity axis lying in the same plane as the Earth angular velocity vector [mathematical expression not reproducible] and consequently the geographical north heading [5, 6].
The astronomical episode occurs due to a tilt in the rotation axis of the earth, which results in dawn being delayed and the sun shining from the far southeast.
Draw a diagram of the earth with equator, cardinal directions, rotation direction, Tropic of Cancer, Tropic of Capricorn, rotation axis, and its current angle in your notebook.
Expanding the above equation, the expression for dynamic model of rotation axis becomes

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