The following events in the fields of science and technology occurred in the year 1577.

Astronomy The Constantinople Observatory of Taqi ad-Din is completed. The Great Comet of 1577 is seen. Tycho Brahe is able to discover from his observations that comets and similar objects travel above the Earth's atmosphere.

Mechanics Guidobaldo del Monte, Marchese del Monte, publishes Mechanicorum Liber in Pisa.

Medicine Publication of John Frampton's , an English translation from Nicolás Monardes' Historia medicinal de las cosas que se traen de nuestras Indias Occidentales (1565).

Technology English race-built galleon Revenge launched at the Royal Dockyard, Deptford, by Master Shipwright Mathew Baker.

Births October 3 – Fortunio Liceti, Italian Aristotelian scientific polymath (died 1657)

Deaths Pietro Andrea Mattioli, Italian physician and botanist (born 1501) Adam von Bodenstein, Swiss alchemist and physician (born 1528)

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