axial âse-yi (#) Fr.: axial Of, pertaining to, characterized by, or forming an axis. |
axial inclination darkil-e âsé Fr.: inclinaison de l'axe The angle at which a planet's axis of rotation is tilted, with respect to that of the planet's orbit. → axial; → inclination. |
axial precession pišâyân-e âse-yi Fr.: précession axiale 1) A change in the orientation of the → rotation axis
of a non-spherical, spinning body caused by → gravity.
A rotating top will precess in a direction determined by the
→ torque exerted by its → weight.
The precession
→ angular velocity is
inversely proportional to the spin angular velocity, so that the
precession is faster and more pronounced as the top slows down. → axial; → precession. |
axial symmetry hamâmuni-ye âse-yi Fr.: symmétrie axiale A symmetry with respect to a line. A geometric configuration is said to have axial symmetry if it remains unchanged when rotated about a given line. |
axial tilt gerâ-ye âsé Fr.: inclinaison de l'axe The angle between an object's → rotation axis and its → orbital axis. In other words, the angle between its → equatorial plane and → orbital plane. Same as → axial inclination and → obliquity, but not to be confounded with → orbital inclination. |
biaxial crystal bolur-e doâsé Fr.: cristal biaxe A birefrigent crystal, such as mica, that is characterized by having two optical axes along which light is propagated with equal velocities. |
equiaxial hamug-âsé Fr.: équiaxe Math.: having three axes of the same length. Also equiaxed. |
paraxial parâse-yi Fr.: paraxial Characteristic of optical analyses that are limited to infinitesimally small apertures. Also called first-order or Gaussian optics. |
paraxial ray partow-e parâse-yi Fr.: rayon paraxial A ray that lies close to and almost parallel to the optical axis and behaves according to paraxial equations. |
solar axial tilt gerâ-ye âse-ye xoršid Fr.: inclinaison de l'axe du Soleil The angle between the Sun's → rotation axis and perpendicular to the → ecliptic plane. In other words, the inclination of the Sun's → equator with respect to the → ecliptic plane. It is 7.25 degrees. |
uniaxial crystal bolur-e yek-âsé Fr.: cristal uniaxe Crystal with double refraction possessing only one → optic axis. |