1611 Establishments In The Dutch Empire
Events January–June * February 27 – Sunspots are observed by telescope, by Frisian astronomers Johannes Fabricius and David Fabricius. 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-Norway 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 i ...
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Sunspots On Sun
Sunspots are phenomena on the Sun's photosphere that appear as temporary spots that are darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic flux that inhibit convection. Sunspots appear within active regions, usually in pairs of opposite magnetic polarity. Their number varies according to the approximately 11-year solar cycle. Individual sunspots or groups of sunspots may last anywhere from a few days to a few months, but eventually decay. Sunspots expand and contract as they move across the surface of the Sun, with diameters ranging from to . Larger sunspots can be visible from Earth without the aid of a telescope. They may travel at relative speeds, or proper motions, of a few hundred meters per second when they first emerge. Indicating intense magnetic activity, sunspots accompany other active region phenomena such as coronal loops, prominences, and reconnection events. Most solar flares and corona ...
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