| 释义 |
antapex Astr.|æntˈeɪpɛks|
Also anti-apex.
[f. ant- + apex.]
The point on the celestial sphere, situated in the constellation Columba, away from which the sun is moving; the point opposite to the apex of the solar way (cf. solar apex s.v. solar a. 7).
1890A. M. Clerke Syst. Stars xxiii. 320 There would be the semblance of a general retreat from the ‘apex’ or solar point de mire, coupled with a thronging-in from all sides towards the opposite point, or ‘anti-apex’. 1906J. C. Kapteyn in Rep. Brit. Assoc. 1905 258 If..we determine these lines of symmetry for several points of the sky and prolong them, they must all intersect in two points, which are no other than the apex and the antapex. 1911Encycl. Brit. XXV. 791/1 The annual parallactic motion is equal to four times the parallax, for a star lying in a direction 90° from the solar apex; for stars nearer the apex or antapex it is foreshortened. 1923R. Astr. Soc., Monthly Notices LXXXIII. 465 Two quantities are of fundamental importance—the angular distance of a star from the apex or ant-apex of the solar motion, and the position angle of the star relative to the apex or ant-apex. 1928W. M. Smart Sun, Stars & Universe x. 171 The sun..is moving towards the solar apex with a speed of 12 miles per second, and therefore our group of stars will appear to us to move as a whole towards the solar antapex. |