Astronomy. A dark elongation of a planet's disc observed at the start and finish of solar transits of Venus and Mercury when the disc of the planet…
单词 | θ554 |
释义 | the world > the universe > planet > primary planet > inferior planet > [noun] > distorted appearance (2) black drop1833 Astronomy. A dark elongation of a planet's disc observed at the start and finish of solar transits of Venus and Mercury when the disc of the planet… pear drop1874 Astronomy. = black drop, n. 2. Obsolete. rare. |
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