1618 in science

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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 20 - Pluto (not known at this time) reaches an aphelion.
• 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.

Medicine

• The College of Physicians of London publishes the Pharmacopœia Londinensis.

Births

• April 2 - Francesco Maria Grimaldi, Italian physicist, discoverer of the diffraction of light (d. 1663)
• Jeremiah Horrocks, English astronomer (d. 1641)

Deaths

• June 6 - Sir James Lancaster, English navigator (b. 1554)
• October 29 - Walter Ralegh, English explorer (b. c.1554)
• Luca Valerio, Italian mathematician (b. 1553)