List of years in science (Table)
… 1599 • 1600 • 1601 • 1602 • 1603 • 1604 • 1605 •    1606 • 1607 • 1608 – 1609 – 1610 • 1611 • 1612 •    1613 • 1614 • 1615 • 1616 • 1617 • 1618 • 1619 …
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… 1606 • 1607 • 1608 – 1609 – 1610 • 1611 • 1612 … … 1570s • 1580s • 1590s – 1600s – 1610s • 1620s • 1630s … … 16th century – 17th century – 18th century …
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The year 1609 in science and technology involved some significant events.

Astronomy

• Johannes Kepler publishes his first two laws of planetary motion.

Technology

• Cornelius Drebbel invents the thermostat.

Publications

• Johannes Kepler publishes Astronomia Nova, with his first two laws of planetary motion.
• Hugo Grotius - Mare liberum.

Births

• June 29 - Pierre Paul Riquet, French engineer and canal builder (died 1680)
• October 8 - John Clarke, English physician (died 1676)

Deaths

• Oswald Croll, German chemist and physician (born c1560)
• Charles de L'Ecluse, (or Clusius), French botanist who published one of the earliest known books on Spanish flora (born 1525)