| 单词 | declination axis |
| 释义 | > as lemmasdeclination axis declination axis n. that axis of an equatorial telescope which is at right angles to the polar axis, and to which is attached at one end the telescope and at the other the declination circle, so called because when the position of the telescope is changed by turning the declination axis there is an alteration in the declination of the object viewed. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes > parts of well1706 declination axis1835 declination circle1835 telescope driver1874 adaptive optics1966 1835 Mechanics' Mag. 24 210/2 On these rollers turns the declination axis. 1888 Encycl. Brit. XXIII. 146/2 The equatorial in its simplest form consists of an axis parallel to the earth's axis, called the ‘polar axis’; a second axis, at right angles to this, called the ‘declination axis’; and a telescope fixed at right angles to the latter. 1905 Westm. Gaz. 17 Apr. 1/3 A large equatorial with a 26-in. photographic refractor at one end of the declination axis and a 30-in. reflector at the other. 1964 R. H. Baker Astron. (ed. 8) iv. 108 The circle on the declination axis is graduated in degrees of declination. < as lemmas |
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