| 单词 | zenith tube |
| 释义 | > as lemmaszenith tube zenith tube n. now rare a form of zenith telescope; (also) a fixed open tube aligned to the zenith, for projecting the image of the sun when overhead. ΘΚΠ the world > the universe > cosmology > science of observation > astronomical instruments > zenith distance > [noun] zenith sector1775 zenith telescope1803 zenith tube1825 1825 Philos. Trans. (Royal Soc.) 115 174 The first zenith tube was I believe constructed for Dr. Tiarks. 1911 Monthly Notices Royal Astron. Soc. 71 541 The series of observations with the Greenwich Reflex Zenith-Tube, starting in 1856 and continued to 1899. 2005 C. Ruggles Anc. Astron. 188 The first appearance of the noonday sun in the Xochicalco zenith tube occurs exactly fifty-two days before the June solstice. < as lemmas |
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