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单词 circumpolar
释义

circumpolarn.

Etymology: < circumpolar adj.Previous versions of the OED give the stress as: circumˈpolar.
A circumpolar star.
ΘΚΠ
the world > the universe > star > kind of star > by position > [noun] > circumpolar
circumpolar1888
1888 C. A. Young Text-bk. Gen. Astron. iv. 70 Determination of Latitude... By Circumpolars.
1910 G. 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.
This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2019).

circumpolaradj.

/səːkəmˈpəʊlə/
Etymology: < circum- prefix 2 + Latin polus pole n.2; compare polar adj.
1. Astronomy. 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.
ΘΚΠ
the world > the universe > celestial sphere > [adjective] > pole > around
circumpolar1687
1687 Philos. Trans. 1686–7 (Royal Soc.) 16 214 Some Circumpolar Stars in the same Vertical with the Pole-star.
1787 Philos. Trans. (Royal Soc.) 77 166 Observations of the sun and circumpolar stars.
1853 J. F. W. Herschel Pop. Lect. Sci. (1873) iii. 133 The comet remained long..visible as a circumpolar object.
1881 Nature 5 May 13/1 This allows the telescope circumpolar motion.
2. Geography. Round or about either terrestrial pole.
ΘΚΠ
the world > the earth > geodetic references > [adjective] > pole
polar1556
polary1559
subpolar1685
circumpolar1696
polifugal1744
poleward1848
bipolar1896
1696 W. Whiston New Theory of Earth iv. 267 The middle, and their neighbouring parts..Elevated, and the circumpolar depress'd.
1864 Sat. Rev. 31 Dec. 819/1 The opinion that there exists an Antartic circumpolar continent.
1880 Carpenter in 19th Cent. No. 38. 612 The vast circumpolar area.
This entry has not yet been fully updated (first published 1889; most recently modified version published online June 2018).
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n.1888adj.1687
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