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1611 (MDCXI)was a common year starting on Saturday of the Gregorian calendar and a common year starting on Tuesday of the Julian calendar, the 1611th year of the Common Era (CE) and Anno Domini (AD) designations, the 611th year of the 2nd millennium, the 11th year of the 17th century, and the 2nd year of the 1610s decade. As of the start of 1611, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
- February 27 – Sunspots are observed by telescope, by Frisian astronomers Johannes Fabricius and David Fabricius, and Johannes publishes the results of these observations, in De Maculis in Sole observatis in Wittenberg, later this year. Such early discoveries are overlooked, however, and the first sighting is claimed a few months later, by Galileo Galilei and Christoph Scheiner.
- March 4 – George Abbot is enthroned as Archbishop of Canterbury.
- March 9 – Battle of Segaba in Begemder: Yemana Kristos, brother of Emperor of Ethiopia Susenyos I, ends the rebellion of Melka Sedeq.
- April 4 – Denmark declares war on Sweden, then captures Kalmar.
- April 28 – The Colegio de Nuestra Señora del Santísimo Rosario is established in Manila, the Philippines (later renamed Colegio de Santo Tomas, now known as the University of Santo Tomas).
- May 2 – The Authorized King James Version of the Bible is published for the first time in London, England, printed by Robert Barker.
- May 9 – In Japan, sixteen-year-old Emperor Go-Mizunoo succeeds Emperor Go-Yōzei.
- June 22 – English explorer and sea captain Henry Hudson, his teenage son John, and six crewmen are set adrift in or near Hudson Bay, after a mutiny on his ship Discovery. They are never seen again.
беларуская (тарашкевіца): 1611
srpskohrvatski / српскохрватски: 1611