| 单词 | zenith sweep |
| 释义 | > as lemmaszenith sweep zenith sweep n. rare and chiefly historical a linear series of observations of a region of the sky passing through the zenith (cf. sweep n. 7). ΘΚΠ the world > the universe > cosmology > science of observation > [noun] > sweep sweep1784 sweeping1786 zenith sweep1790 1790 Philos. Trans. (Royal Soc.) 80 10 My twenty-feet speculum was so much tarnished by zenith sweeps, in which it had been..exposed to falling dews. 1976 Jrnl. Hist. Astron. 7 88 Even zenith sweeps could be made, but Herschel had to arrange a weight to work against the great motion rope. < as lemmas |
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