List of years in science (Table)
… 1611 • 1612 • 1613 • 1614 • 1615 • 1616 • 1617 •    1618 • 1619 • 1620 – 1621 – 1622 • 1623 • 1624 •    1625 • 1626 • 1627 • 1628 • 1629 • 1630 • 1631 …
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… 1618 • 1619 • 1620 – 1621 – 1622 • 1623 • 1624 … … 1590s • 1600s • 1610s – 1620s – 1630s • 1640s • 1650s … … 16th century – 17th century – 18th century …
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The year 1621 in science and technology involved some significant events.

Events

• Johannes Schreck (1576-1630), also known as Johannes Terrenz or Terrentius, introduces the telescope to China.

Technology

• A simple microscope is developed.

Births

• Thomas Willis, English physician who contributed to knowledge of the nervous and cardiovascular systems (died 1673)

Deaths