NationMaster - Encyclopedia: Yrjö Väisälä

Yrjö Väisälä (September 6, 1891 - July 21, 1971) was a Finnish astronomer and physicist. September 6 is the 249th day of the year (250th in leap years). ... 1891 was a common year starting on Thursday (see link for calendar). ... July 21 is the 202nd day (203rd in leap years) of the year in the Gregorian Calendar, with 163 days remaining. ... 1971 is a common year starting on Friday (click for link to calendar). ... The Republic of Finland (Finnish: Suomen tasavalta, Swedish: Republiken Finland) is a Nordic country in northeastern Europe, bordered by the Baltic Sea to the southwest, the Gulf of Finland to the southeast and the Gulf of Bothnia to the west. ... Wikipedia does not yet have an article with this exact name. ... The word physicist should not be confused with physician, which means medical doctor. ...

[A note on dates: the birth date is most likely a Gregorian calendar date, because although Finland was part of Russia at the time and Russia used the Julian calendar until 1918, the Gregorian calendar continued in official use in Finland because Finland had been part of Sweden when Sweden had converted to the Gregorian calendar in 1753.] The Gregorian calendar is the calendar widely used in the Western world. ... The Russian Federation (Russian: Росси́йская Федера́ция, transliteration: Rossiyskaya Federatsiya or Rossijskaja Federacija), or Russia (Russian: Росси́я, transliteration: Rossiya or Rossija), is a country that stretches over a vast expanse of eastern Europe and northern Asia. ... The Julian calendar was introduced by Julius Caesar in 46 BC, taking force in 45 BC or 709 ab urbe condita. ... 1918 was a common year starting on Tuesday (see link for calendar). ... The Kingdom of Sweden (Swedish: Konungariket Sverige listen) is a Nordic country in Scandinavia, in Northern Europe. ... Events January 1 - Britain and its colonies adopt the idea that 1st January should be New Years Day, following adoption of the Gregorian calendar in September 1752. ...

His main contributions were in the field of optics. He developed several methods for measuring the quality of optical elements. This allowed the construction of some of the earliest high-quality Schmidt telescopes. Some historians even claim that Väisälä invented the Schmidt telescope independently, but this has remained an open question. The Schmidt telescopes he built were used at the University of Turku for searches of asteroids and comets. His research group discovered several comets and more than 800 asteroids. See also list of optical topics. ... 50 cm refracting telescope at Nice Observatory. ... Abo redirects here. ... An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... Comet Hale-Bopp, showing a white dust tail and blue gas tail (February 1997) Comet (disambiguation). ...

Notably discovered the periodic comets 40P/Vaisala and 139P/Vaisala-Oterma (the latter co-discovered with Liisi Oterma). Liisi Oterma (1915 – 2001) was a Finnish astronomer, the first woman to get a Ph. ...

A crater on the Moon is named after him, and so is the asteroid 1573 Väisälä. This article is about impact craters. ... For other moons in the solar system see natural satellite. ... An asteroid is a small, solid object in our Solar System, orbiting the Sun. ...

Categories: Articles to be expanded | 1891 births | 1971 deaths | Finnish astronomers Wikipedia Logo File links The following pages link to this file: Talk:Amino acid Australian Army Boxing Bioterrorism Brick Broadway (Manhattan) Geography of Canada Transportation in Chile Confucius Colorado Rockies Origins beliefs Democracy Document Type Definition Equuleus East Slavic languages Flanders Fifth Monarchy Men Grenada Geyser Harry Potter Information explosion... An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... February 16 is the 47th day of the year in the Gregorian Calendar. ... 1936 was a leap year starting on Wednesday (link will take you to calendar). ... August 26 is the 238th day of the year in the Gregorian Calendar (239th in leap years). ... 1936 was a leap year starting on Wednesday (link will take you to calendar). ... September 12 is the 255th day of the year (256th in leap years). ... 1936 was a leap year starting on Wednesday (link will take you to calendar). ... September 13 is the 256th day of the year (257th in leap years). ... 1936 was a leap year starting on Wednesday (link will take you to calendar). ... November 21 is the 325th day of the year (326th in leap years) in the Gregorian Calendar. ... 1936 was a leap year starting on Wednesday (link will take you to calendar). ... March 18 is the 77th day of the year in the Gregorian calendar (78th in leap years). ... 1936 was a leap year starting on Wednesday (link will take you to calendar). ... January 9 is the 9th day of the year in the Gregorian calendar. ... 1937 was a common year starting on Friday (link will take you to calendar). ... January 26 is the 26th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... January 26 is the 26th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 16 is the 47th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 20 is the 51st day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 20 is the 51st day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 22 is the 53rd day of every year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... March 8 is the 67th day of the year in the Gregorian Calendar (68th in Leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 16 is the 47th day of the year in the Gregorian Calendar. ... 1936 was a leap year starting on Wednesday (link will take you to calendar). ... November 24 is the 328th day (329th on leap years) of the year in the Gregorian Calendar. ... 1937 was a common year starting on Friday (link will take you to calendar). ... February 6 is the 37th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 6 is the 37th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... September 16 is the 259th day of the year (260th in leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... October 18 is the 291st day of the year (292nd in Leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... October 22 is the 295th day of the year (296th in leap years) in the Gregorian Calendar, with 70 days remaining. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 6 is the 37th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 6 is the 37th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 16 is the 47th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 18 is the 49th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 24 is the 55th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... December 15 is the 349th day of the year (350th in leap years) in the Gregorian calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... March 23 is the 82nd day of the year in the Gregorian Calendar (83rd in Leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... September 16 is the 259th day of the year (260th in leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... September 21 is the 264th day of the year (265th in leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... September 22 is the 265th day of the year (266th in leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... September 22 is the 265th day of the year (266th in leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... September 16 is the 259th day of the year (260th in leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... October 16 is the 289th day of the year (290th in Leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... October 16 is the 289th day of the year (290th in Leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... December 15 is the 349th day of the year (350th in leap years) in the Gregorian calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... October 15 is the 288th day of the year (289th in Leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... October 15 is the 288th day of the year (289th in Leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... October 22 is the 295th day of the year (296th in leap years) in the Gregorian Calendar, with 70 days remaining. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... October 22 is the 295th day of the year (296th in leap years) in the Gregorian Calendar, with 70 days remaining. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... January 18 is the 18th day of the year in the Gregorian Calendar. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... September 18 is the 261st day of the year (262nd in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... September 18 is the 261st day of the year (262nd in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... October 7 is the 280th day of the year (281st in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... October 18 is the 291st day of the year (292nd in Leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... January 26 is the 26th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... September 16 is the 259th day of the year (260th in leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... September 16 is the 259th day of the year (260th in leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... January 19 is the 19th day of the year in the Gregorian Calendar. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... January 20 is the 20th day of the year in the Gregorian Calendar. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... September 9 is the 252nd day of the year (253rd in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... September 18 is the 261st day of the year (262nd in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... February 12 is the 43rd day of the year in the Gregorian Calendar. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... August 26 is the 238th day of the year in the Gregorian Calendar (239th in leap years). ... 1941 was a common year starting on Wednesday (link will take you to calendar). ... March 26 is the 85th day of the year in the Gregorian Calendar (86th in leap years). ... 1935 was a common year starting on Tuesday (link will take you to calendar). ... April 2 is the 92nd day of the year (93rd in leap years) in the Gregorian calendar, with 273 days remaining. ... 1937 was a common year starting on Friday (link will take you to calendar). ... February 24 is the 55th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 24 is the 55th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... April 22 is the 112th day of the year in the Gregorian calendar (113th in leap years). ... 1941 was a common year starting on Wednesday (link will take you to calendar). ... October 11 is the 284th day of the year (285th in Leap years). ... 1936 was a leap year starting on Wednesday (link will take you to calendar). ... January 19 is the 19th day of the year in the Gregorian Calendar. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... March 11 is the 70th day of the year in the Gregorian Calendar (71st in Leap year). ... 1942 was a common year starting on Thursday (link will take you to calendar). ... December 28 is the 362nd day of the year (363rd in leap years) in the Gregorian Calendar, with 3 days remaining. ... 1940 was a leap year starting on Monday (link will take you to calendar). ... September 6 is the 249th day of the year (250th in leap years). ... 1940 was a leap year starting on Monday (link will take you to calendar). ... December 28 is the 362nd day of the year (363rd in leap years) in the Gregorian Calendar, with 3 days remaining. ... 1940 was a leap year starting on Monday (link will take you to calendar). ... March 18 is the 77th day of the year in the Gregorian calendar (78th in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... August 26 is the 238th day of the year in the Gregorian Calendar (239th in leap years). ... 1941 was a common year starting on Wednesday (link will take you to calendar). ... March 18 is the 77th day of the year in the Gregorian calendar (78th in leap years). ... 1936 was a leap year starting on Wednesday (link will take you to calendar). ... October 18 is the 291st day of the year (292nd in Leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... March 17 is the 76th day of the year in the Gregorian Calendar (77th in Leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... December 4 is the 338th day (339th on leap years) of the Gregorian calendar. ... 1942 was a common year starting on Thursday (link will take you to calendar). ... September 21 is the 264th day of the year (265th in leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ... January 20 is the 20th day of the year in the Gregorian Calendar. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... March 4 is the 63rd day of the year in the Gregorian Calendar (64th in leap years). ... 1935 was a common year starting on Tuesday (link will take you to calendar). ... March 18 is the 77th day of the year in the Gregorian calendar (78th in leap years). ... 1936 was a leap year starting on Wednesday (link will take you to calendar). ... February 23 is the 54th day of the year in the Gregorian Calendar. ... 1936 was a leap year starting on Wednesday (link will take you to calendar). ... April 26 is the 116th day of the year in the Gregorian Calendar (117th in leap years). ... 1941 was a common year starting on Wednesday (link will take you to calendar). ... October 18 is the 291st day of the year (292nd in Leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... April 3 is the 93rd day of the year (94th in leap years) in the Gregorian calendar, with 272 days remaining. ... 1940 was a leap year starting on Monday (link will take you to calendar). ... March 3 is the 62nd day of the year in the Gregorian Calendar (63rd in leap years). ... 1943 is a common year starting on Friday. ... September 25 is the 268th day of the year (269th in leap years). ... 1941 was a common year starting on Wednesday (link will take you to calendar). ... October 7 is the 280th day of the year (281st in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... September 7 is the 250th day of the year (251st in leap years). ... 1942 was a common year starting on Thursday (link will take you to calendar). ... September 25 is the 268th day of the year (269th in leap years). ... 1941 was a common year starting on Wednesday (link will take you to calendar). ... March 3 is the 62nd day of the year in the Gregorian Calendar (63rd in leap years). ... 1943 is a common year starting on Friday. ... September 21 is the 264th day of the year (265th in leap years). ... 1941 was a common year starting on Wednesday (link will take you to calendar). ... February 22 is the 53rd day of every year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... September 21 is the 264th day of the year (265th in leap years). ... 1941 was a common year starting on Wednesday (link will take you to calendar). ... January 19 is the 19th day of the year in the Gregorian Calendar. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... February 6 is the 37th day of the year in the Gregorian Calendar. ... 1942 was a common year starting on Thursday (link will take you to calendar). ... March 22 is the 81st day of the year in the Gregorian Calendar (82nd in Leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... March 3 is the 62nd day of the year in the Gregorian Calendar (63rd in leap years). ... 1943 is a common year starting on Friday. ... April 3 is the 93rd day of the year (94th in leap years) in the Gregorian calendar, with 272 days remaining. ... 1940 was a leap year starting on Monday (link will take you to calendar). ... February 17 is the 48th day of the year in the Gregorian calendar. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... September 19 is the 262nd day of the year (263rd in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... April 9 is the 99th day of the year in the Gregorian calendar (100th in leap years). ... 1940 was a leap year starting on Monday (link will take you to calendar). ... February 24 is the 55th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... October 7 is the 280th day of the year (281st in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... February 24 is the 55th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... October 22 is the 295th day of the year (296th in leap years) in the Gregorian Calendar, with 70 days remaining. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... October 7 is the 280th day of the year (281st in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... February 22 is the 53rd day of every year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 22 is the 53rd day of every year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... December 30 is the 364th day of the year (365th in leap years) in the Gregorian Calendar, with 1 day remaining. ... 1940 was a leap year starting on Monday (link will take you to calendar). ... January 19 is the 19th day of the year in the Gregorian Calendar. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... September 8 is the 251st day of the year (252nd in leap years). ... 1942 was a common year starting on Thursday (link will take you to calendar). ... October 18 is the 291st day of the year (292nd in Leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... October 7 is the 280th day of the year (281st in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... February 20 is the 51st day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... December 28 is the 362nd day of the year (363rd in leap years) in the Gregorian Calendar, with 3 days remaining. ... 1940 was a leap year starting on Monday (link will take you to calendar). ... October 7 is the 280th day of the year (281st in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... January 17 is the 17th day of the year in the Gregorian Calendar. ... 1944 was a leap year starting on Saturday (link will take you to calendar). ... April 3 is the 93rd day of the year (94th in leap years) in the Gregorian calendar, with 272 days remaining. ... 1940 was a leap year starting on Monday (link will take you to calendar). ... March 30 is the 89th day of the year in the Gregorian Calendar (90th in Leap years). ... 1940 was a leap year starting on Monday (link will take you to calendar). ... February 19 is the 50th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... September 7 is the 250th day of the year (251st in leap years). ... 1942 was a common year starting on Thursday (link will take you to calendar). ... February 24 is the 55th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... February 24 is the 55th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... September 21 is the 264th day of the year (265th in leap years). ... 1941 was a common year starting on Wednesday (link will take you to calendar). ... September 19 is the 262nd day of the year (263rd in leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... September 8 is the 251st day of the year (252nd in leap years). ... 1942 was a common year starting on Thursday (link will take you to calendar). ... February 24 is the 55th day of the year in the Gregorian Calendar. ... 1938 was a common year starting on Saturday (link will take you to calendar). ... December 28 is the 362nd day of the year (363rd in leap years) in the Gregorian Calendar, with 3 days remaining. ... 1940 was a leap year starting on Monday (link will take you to calendar). ... January 20 is the 20th day of the year in the Gregorian Calendar. ... 1939 was a common year starting on Sunday (link will take you to calendar). ... March 3 is the 62nd day of the year in the Gregorian Calendar (63rd in leap years). ... 1943 is a common year starting on Friday. ... April 9 is the 99th day of the year in the Gregorian calendar (100th in leap years). ... 1940 was a leap year starting on Monday (link will take you to calendar). ... October 18 is the 291st day of the year (292nd in Leap years). ... 1939 was a common year starting on Sunday (link will take you to calendar). ... September 22 is the 265th day of the year (266th in leap years). ... 1938 was a common year starting on Saturday (link will take you to calendar). ...