单词	sidereal day
释义	sidereal day noun plural sidereal days : the interval between two successive transits of a point on the celestial sphere (such as the vernal equinox) over the upper meridian of a place : 23 hours, 56 minutes, 4.1 seconds of mean time In recent experiments, the frequency … was found to vary by not more than 100 μHz over a sidereal day as the rotation of the earth changed the orientation of the ions (fixed by the laboratory magnetic field) with respect to the external universe. David Golden Word History First Known Use circa 1678, in the meaning defined above
随便看	dust ball dust board dust bottom dust bowl dust bowler dust bowls dust bunny dust cap dust cart dust chamber dust counter dust devil dust disease dust exhaust dust furrow dust gun dust jacket dust louse dust mite dust mop dust mulch dust off dust oneself down dust oneself off dust pearl

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