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单词 θ1517
释义
the world > the universe > cosmology > science of observation > [noun] > sweep (3)
sweep1784

Astronomy. A term used by Sir William Herschel to denote a method of surveying the heavens in sections (see quots. and cf. sweep, v. 21); also, one…

sweeping1786

The action of sweep, v. Astronomy: see sweep, v. 21.

zenith sweep1790

a linear series of observations of a region of the sky passing through the zenith (cf. sweep, n. 7).

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