Friederich Wilhelm Gustav Spörer (October 23, 1822 – July 7, 1895) was a German astronomer. October 23 is the 296th day of the year (297th in leap years) in the Gregorian Calendar, with 69 days remaining. ... Events March 30 - Florida becomes a United States territory. ... July 7 is the 188th day of the year (189th in leap years) in the Gregorian Calendar, with 177 days remaining. ... 1895 was a common year starting on Tuesday (see link for calendar). ... The Federal Republic of Germany (German: Bundesrepublik Deutschland) is one of the worlds leading industrialised countries, located in the heart of Europe. ... Wikipedia does not yet have an article with this exact name. ...

He is noted for his studies of sunspots and sunspot cycles. In this regard his name is often mentioned together with Edward Maunder. Spörer was first to note a prolonged period of low sunspot activity from 1645 to 1715, this period is known as the Maunder Minimum. 400 year sunspot history A sunspot is a region on the Suns surface (photosphere) that is marked by a lower temperature than its surroundings, and intense magnetic activity. ... Edward Walter Maunder (April 12, 1851 – March 21, 1928) was an English astronomer best remembered for his study of sunspots and the solar magnetic cycle that led to his identification of the period from 1645 to 1715 that is now known as the Maunder Minimum. ... Events February 15 - English Civil War: New Model Army is founded officially June 14 - English Civil War: Battle of Naseby - 12,000 Royalist forces are beaten by 15,000 Parliamentarian soldiers June 28 - English Civil War - the Royalists lose Carlisle July 2: Fight at Alford, Aberdeenshire October 8: Jeanne Mance... Events September 1 - King Louis XIV of France dies after a reign of 72 years, leaving the throne of his exhausted and indebted country to his great-grandson Louis XV. Regent for the new, five years old monarch is Philippe dOrléans, nephew of Louis XIV. September - First of the... The Maunder minimum in a 400 year history of sunspot numbers The Maunder Minimum is the name given to the period roughly from 1645 to 1715 A.D., when sunspots became exceedingly rare, as noted by solar observers of the time. ...

Spörer was a contemporary of Richard Christopher Carrington, an English astronomer. Carrington is generally credited with discovering Spörer's law, which governs the variation of sunspot latitudes during the course of a solar cycle. Spörer added to Carrington's observations of sunspot drift, and is sometimes credited with the discovery. Richard Christopher Carrington (May 26, 1826 – November 27, 1875) was an English astronomer who discovered the differential rotation of the sun by means of sunspot observations in 1863. ... Categories: Stub | Stellar phenomena | Solar phenomena ...

The Spörer minimum was a period of low sunspot activity roughly between 1420 to 1570. Events May 21 - Treaty of Troyes. ... Events January 23 - The assassination of regent James Stewart, Earl of Moray throws Scotland into civil war February 25 - Pope Pius V excommunicates Queen Elizabeth I of England. ...

External link

• http://www.hao.ucar.edu/public/education/sp/images/spoerer.html