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1899 in science : ウィキペディア英語版 | 1899 in science
The year 1899 in science involved some significant events, listed below. ==Astronomy==
* December 2 – During the new moon, a near-grand conjunction of the classical planets and several binocular Solar System bodies occur. The Sun, Moon, Mercury, Mars and Saturn are all within 15° of each other, with Venus 5° ahead of this conjunction and Jupiter 15° behind. Accompanying the classical planets in this grand conjunction are Uranus (technically visible unaided in pollution-free skies), Ceres and Pallas. * The 80 cm refracting telescope is completed at Potsdam Observatory.
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