Of accelerating, or the state of being accelerated. To move or cause to move with increasing velocity.Īcceleration. The term is used to refer to a particularĭeep part of the ocean, or to any part below 300 fathoms.Īccelerate. The theoretical temperature at which molecular motionĪbyss. The process by which radiant energy is absorbed and converted
Number indicate that its absolute value is intended.Ībsorption. The value of a real number without regard to sign. The size of a degree on the FahrenheitĪbsolute value. The sizes of the Kelvin andĬelsius degree are equal. Is zero on the Kelvin scale, 273.16☌ on the Celsius scale, andĤ59.69☏ on the Fahrenheit scale. Temperature measured from absolute zero which Would be absolute motion, or motion relative to a fixed point.Īctual motion is motion of an object relative to the earth.Ībsolute temperature. To the earth, would be due only to the motion of that body. In space, any change in the position of another body, relative The mass of water vapor per unit volume of air.Ībsolute motion. See ISOTROPIC GAIN (of an antenna).Ībsolute humidity. The ability of a navigation or positioning system toĭefine an exact location in relation to a coordinate system.Ībsolute gain. Pertaining to measurement relative to a universal constant or natural datum.Ībsolute accuracy. The horizontal coordinate of a set of rectangular coordinates.Īlso used in a similar sense in connection with oblique coordinates.Ībsolute. A squall frequent from May through August between Caboĭe Sao Tome and Cabo Frio on the coast of Brazil.Ībrupt. Rubbing or wearing away, or the result of such action.Ībroholos.
Wasting of snow or ice by melting or evaporation.Ībrasion. This is termed chromatic aberration, and is practically eliminated over a moderate range of wavelengths by using a composite lens, called an achromatic lens, composed of parts having different dispersive powers.Īberration constant. Aberration may also result from differences in the wavelengths of light of different colors: light of the shorter wavelengths (violet end of the spectrum) comes to a focus nearer the lens than light of the longer wavelengths (red end of the spectrum). A lens so corrected is called an aplanatic lens.
This is termed spherical aberration and, being due to the faulty figure of the lens, is eliminated by correcting that figure. In a single lens having spherical surfaces, aberration may be caused by differences in the focal lengths of the various parts of the lens: rays passing through the outer part of the lens come to a focus nearer the lens than do rays passing through its central part. The convergence to different foci, by a lens or mirror, of parallel rays of light. The aberration due to the motion of the center of mass of the solar system in space is termed secular aberration but is not taken into account in practical astronomy. The aberration due to the revolution of the earth about the sun is termed annual aberration. The aberration due to the rotation of the earth on its axis is termed diurnal aberration or daily aberration.
When, in addition to the combined effect of the velocity of light and the motion of the earth, account is taken of the motion of the celestial body in space during the interval that the light is traveling to the earth from the luminous body, as in the case of planets, the phenomenon is termed planetary aberration. The apparent displacement of a celestial body in the direction of motion of the earth in its orbit caused by the motion of the earth combined with the finite velocity of light. In a line approximately at right angle to the ship’s keel opposite the waist or middle part of a ship. The unit of current in the centimeter gram-second electromagnetic system. Any direction between broad on the beam and astern. See also ABAFT THE BEAM, AFT, ASTERN.Ībaft the beam. In a direction farther aft in a ship than a specified reference position, such as abaft the mast.
0 kommentar(er)
