Astronomy. The part of a circle which a heavenly body appears to pass through above (diurnal arc) or below (nocturnal arc) the horizon. The earliest…
单词 | θ230 |
释义 | the world > the universe > heavenly body > movement of heavenly bodies > [noun] > movement in orbit > orbit > diurnal circle > parts of (3) arcc1386 Astronomy. The part of a circle which a heavenly body appears to pass through above (diurnal arc) or below (nocturnal arc) the horizon. The earliest… nocturnal arch1681 = nocturnal arc n. nocturnal arc1704 the arc on the celestial sphere as described by a celestial object below the horizon, between its setting and its rising. |
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