| 释义 |
▪ I. circumpolar, a.|sɜːkəmˈpəʊlə(r)|
[f. circum- 2 + L. polus pole; cf. polar.]
1. Astr. Around or about the pole (of the heavens); spec. applied to those stars (or other heavenly bodies) which (in any given latitude) describe the whole of their diurnal circles above the horizon. So circumpolar motion.
1686Phil. Trans. XVI. 214 Some Circumpolar Stars in the same Vertical with the Pole-star. 1787Ibid. LXXVII. 166 Observations of the sun and circumpolar stars. 1853Sir J. Herschel Pop. Lect. Sc. iii. (1873) 133 The comet remained long..visible as a circumpolar object. 1881Nature XXIV. 13 This allows the telescope circumpolar motion.
2. Geog. Round or about either terrestrial pole.
1696Whiston Th. Earth iv. (1722) 343 The middle, and their neighbouring Parts..elevated, and the Circumpolar [printed Circumpopular] depress'd. 1864Sat. Rev. 31 Dec. 819/1 The opinion that there exists an Antartic circumpolar continent. 1880Carpenter in 19th Cent. No. 38. 612 The vast circumpolar area.
▪ II. circumˈpolar, n.
[f. the adj.]
A circumpolar star.
1888C. A. Young Text Bk. Gen. Astron. iv. 70 Determination of Latitude... By Circumpolars. 1910G. L. Hosmer Text-Bk. Pract. Astron. 30 If the observer travels north until he is beyond the arctic circle, latitude 66° 33′ north, then the sun becomes a circumpolar at the time of the summer solstice. |