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The year 1621 in science and technology involved some significant events.
AstronomyEdit
- Johann Schreck (1576–1630), also known as Johannes Schreck, Terrenz or Terrentius, introduces the telescope to China.<ref>{{#invoke:citation/CS1|citation
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BotanyEdit
- The University of Oxford Botanic Garden, the oldest botanical garden in Great Britain, is founded as a physic garden by Henry Danvers, 1st Earl of Danby.<ref>{{#invoke:citation/CS1|citation
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MedicineEdit
- Robert Burton publishes his treatise The Anatomy of Melancholy.
PhysicsEdit
- Willebrord Snellius formulates Snell's law on refraction.
TechnologyEdit
- A simple microscope is developed.
- Cornelius Vermuyden begins reclamation of Canvey Island in England.
BirthsEdit
- January 27 – Thomas Willis, English physician who contributes to knowledge of the nervous and cardiovascular systems (died 1675)
DeathsEdit
- July 2 – Thomas Harriot, English ethnographer, astronomer and mathematician (born c. 1560)
- September 1 – Bahāʾ al-dīn al-ʿĀmilī, Arab philosopher and astronomer (born 1547)
- Jan Jesenius, Slovak physician (born 1566)