| 单词 | equatorial circle |
| 释义 | > as lemmasequatorial circle 2. equatorial instrument (also equatorial telescope): an apparatus consisting essentially of a telescope attached by an arm to an axle revolving in a direction parallel to the plane of the equator. By a uniform motion given to this axle (in large instruments by clockwork) the telescope follows the diurnal apparent motion of any point in the heavens to which it is directed. equatorial circle: a graduated circle (otherwise called hour-circle, right-ascension-circle) revolving in a plane parallel to the equator, forming part of the equatorial instrument. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > equatorial telescope equatorial instrument1791 equatorial1793 1791 T. Jefferson in Harper's Mag. (1885) Mar. 535/2 He is to pay for equatorial instrument. 1793 G. Shuckburgh Equator. Instr. in Philos. Trans. (Royal Soc.) 83 72 The idea of an equatorial telescope was again renewed by three several artists in this kingdom. 1868 G. B. Airy Pop. Astron. (ed. 6) ii. 39 For causing the Equatoreal instrument to revolve uniformly. < as lemmas |
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