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1618 in science : ウィキペディア英語版 | 1618 in science
The year 1618 in science and technology involved some significant events. ==Astronomy==
* March 8 – May 15 – Johannes Kepler formulates the third law of planetary motion. * July 21 – Pluto (not known at this time) reaches an aphelion. It also came to aphelion in 1866. * Johann Baptist Cysat, Swiss Jesuit geometer and astronomer and one of Christoph Scheiner's pupils, becomes the first to study a comet through the telescope and gives the first description of the nucleus and coma of a comet. * September 6–25 – The Great Comet of 1618 is visible to the naked eye.
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