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Dick Walker (astronomer)
Richard Lee Walker Jr. (March 9, 1938 – March 30, 2005) was an American astronomer known for his observations of double stars and for discovering Epimetheus, an inner moon of Saturn. Interested in astronomy since his youth, he graduated from the University of Iowa in 1963 after studying physics and astronomy under James Van Allen and Satoshi Matsushima. He began work at the United States Naval Observatory (USNO) in Washington, D. C., in 1963. Initially assigned to the USNO's Time Service, he switched to work observing double stars alongside Kaj Strand. Walker continued his focus on double stars after transfer to the USNO Flagstaff Station in 1966, ultimately making 8,000 measurements over the course of his career. Shortly after his arrival in Flagstaff, he discovered a small inner moon of Saturn. Initially identified with Audouin Dollfus's newly-discovered Janus, it was confirmed as a separate moon twelve years later and named Epimetheus. He retired from the Naval Observat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Northern Iowa
The University of Northern Iowa (UNI) is a public university in Cedar Falls, Iowa, United States. UNI offers more than 90 majors across five colleges. The fall 2024 total enrollment was 9,283 students. The university was initially founded in 1876 as the Iowa State Normal School with the purpose of training school teachers and educators. The University of Northern Iowa is one of three public universities in Iowa, all of which are governed by the Iowa Board of Regents. History The University of Northern Iowa was founded as a result of two influential forces of the nineteenth century. First, Iowa wanted to care for orphans of its Civil War veterans, and secondly, Iowa needed a public teacher training institution. In 1876, when Iowa no longer needed an orphan home, legislators Edward G. Miller and H. C. Hemenway started the Iowa State Normal School.University of Northern Iowa, Gerald L. Peterson, Aracadia Publishing, 2000. The school's first building opened in 1867 and was known ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
10717 Dickwalker
1 (one, unit, unity) is a number, numeral, and glyph. It is the first and smallest positive integer of the infinite sequence of natural numbers. This fundamental property has led to its unique uses in other fields, ranging from science to sports, where it commonly denotes the first, leading, or top thing in a group. 1 is the unit of counting or measurement, a determiner for singular nouns, and a gender-neutral pronoun. Historically, the representation of 1 evolved from ancient Sumerian and Babylonian symbols to the modern Arabic numeral. In mathematics, 1 is the multiplicative identity, meaning that any number multiplied by 1 equals the same number. 1 is by convention not considered a prime number. In digital technology, 1 represents the "on" state in binary code, the foundation of computing. Philosophically, 1 symbolizes the ultimate reality or source of existence in various traditions. In mathematics The number 1 is the first natural number after 0. Each natural number, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert E
The name Robert is an ancient Germanic given name, from Proto-Germanic "fame" and "bright" (''Hrōþiberhtaz''). Compare Old Dutch ''Robrecht'' and Old High German ''Hrodebert'' (a compound of '' Hruod'' () "fame, glory, honour, praise, renown, godlike" and ''berht'' "bright, light, shining"). It is the second most frequently used given name of ancient Germanic origin.Reaney & Wilson, 1997. ''Dictionary of English Surnames''. Oxford University Press. It is also in use as a surname. Another commonly used form of the name is Rupert. After becoming widely used in Continental Europe, the name entered England in its Old French form ''Robert'', where an Old English cognate form (''Hrēodbēorht'', ''Hrodberht'', ''Hrēodbēorð'', ''Hrœdbœrð'', ''Hrœdberð'', ''Hrōðberχtŕ'') had existed before the Norman Conquest. The feminine version is Roberta. The Italian, Portuguese, and Spanish form is Roberto. Robert is also a common name in many Germanic languages, including En ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georgetown University Astronomical Observatory
The Georgetown University Astronomical Observatory (also the Heyden Observatory and Francis J. Heyden Observatory) was founded in 1841 by Father James Curley of the Department of Physics at Georgetown College. Father Curley chose a site on the college grounds, planned the building, and supervised its construction to its completion in 1844. Costs were initially paid by Rev. Thomas Meredith Jenkins, S.J., and Rev. Charles H. Stonestreet, S.J., who were Georgetown professors at the time. The observatory was used in 1846 to determine the latitude and longitude of Washington, D.C., which Curley determined to be latitude 38°54′26N and longitude 5h8m18.29s (west of Greenwich). In 1850, Benedict Sestini used the Observatory to make a series of sunspot drawings, which were engraved and published (44 plates) as "Appendix A" of the Naval Observatory volume for 1847, printed in 1853. In 1888, Johann Georg Hagen was named director. He was responsible for the installation of the 12-inch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stewart Sharpless
Stewart Sharpless (March 29, 1926 – January 19, 2013) was an American astronomer who carried out fundamental work on the structure of the Milky Way galaxy. As a graduate student at Yerkes Observatory he worked under William Morgan with fellow graduate student Don Osterbrock. He helped Harold Johnson and Morgan with calculations used to help define the UBV photometric system. In 1952, Sharpless and Osterbrock published their observations that demonstrated the spiral structure of the Milky Way by estimating the distances to H II regions and young hot stars. For a while Sharpless was at Mount Wilson Observatory where he worked on galaxy photography with Walter Baade and Edwin Hubble. In 1953 Sharpless joined the staff of the United States Naval Observatory Flagstaff Station. Here he surveyed and cataloged H II regions of the Milky Way Galaxy using the images from the Palomar Sky Survey. From this work Sharpless published his catalog of H II regions in two editions, the first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Libration
In lunar astronomy, libration is the cyclic variation in the apparent position of the Moon that is perceived by observers on the Earth and caused by changes between the orbital and rotational planes of the moon. It causes an observer to see slightly different hemispheres of the surface at different times. It is similar in both cause and effect to the changes in the Moon's apparent size because of changes in lunar distance (astronomy), distance. It is caused by three mechanisms detailed below, two of which cause a relatively tiny physical libration via tidal forces exerted by the Earth. Such true librations are known as well for other moons with locked rotation. The quite different phenomenon of a trojan asteroid's movement has been called ''Trojan libration'', and ''Trojan libration point'' means Lagrangian point. Lunar libration The Moon keeps one wikt:hemisphere, hemisphere of itself facing the Earth because of tidal locking. Therefore, the first view of the far side of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Markowitz
William Markowitz (February 8, 1907 – October 10, 1998) was an American astronomer known for his work on the standardization of time. Early life and education William Markowitz was born Melč in Austrian Silesia (now in the Czech Republic) on February 8, 1907. His mother had been visiting from her native Poland. The family emigrated to the United States in 1910, settling in Chicago. Markowitz obtained his doctorate from the University of Chicago in 1931 under the supervision of William Duncan MacMillan with a thesis on the statistics of binary stars. Career He taught at Pennsylvania State College before joining the United States Naval Observatory in 1936, working under Paul Sollenberger and Gerald Clemence in the time service department. Markowitz eventually became director of the department. He developed the ephemeris time scale, which had been adopted by the IAU in 1952 on a proposal formulated by Clemence in 1948,See references (incl. citations to some of Marko ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reflecting Telescope
A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century by Isaac Newton as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic aberration. Although reflecting telescopes produce other types of optical aberrations, it is a design that allows for very large diameter Objective (optics), objectives. Almost all of the major telescopes used in astronomy research are reflectors. Many variant forms are in use and some employ extra optical elements to improve image quality or place the image in a mechanically advantageous position. Since reflecting telescopes use mirrors, the design is sometimes referred to as a catoptrics, catoptric telescope. From the time of Newton to the 1800s, the mirror itself was made of metalusually speculum metal. This type included Newton's first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Waterloo Courier
''The Waterloo-Cedar Falls Courier'' is a daily afternoon newspaper published by Lee Enterprises for people living in Waterloo and Cedar Falls, Iowa as well as northeast Iowa. History The first issue of ''The Waterloo-Cedar Falls Courier'' was published on November 22, 1859, by WH Hartman and George Ingersoll. ''The Courier'' changed to a daily newspaper in 1890, publishing in the afternoon every day except Saturday. Howard Publications bought the ''Waterloo Courier'' and ''Cedar Falls Record'' in 1983. At that time, the ''Courier'' had been owned for 128 years by the same family, and had a daily circulation of around 55,000 in 1983. The circulation of ''The Record'' was about 4,000.(27 January 1983)The impending sale of the Waterloo Courier and the... ''UPI'' Lee Enterprises acquired the Howard chain in 2002.(13 February 2002)Lee Newspapers to buy Howard Publications ''The Baltimore Sun ''The Baltimore Sun'' is the largest general-circulation daily newspaper based in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Institute Of Physics
The American Institute of Physics (AIP) promotes science and the profession of physics, publishes physics journals, and produces publications for scientific and engineering societies. The AIP is made up of various member societies. Its corporate headquarters are at the American Center for Physics in College Park, Maryland, but the institute also has offices in Melville, New York, and Beijing. Historical overview The AIP was founded in 1931 as a response to lack of funding for the sciences during the Great Depression. /www.aip.org/aip/history "History of AIP" American Institute of Physics. July 2010. The AIP was founded in 1931 at a joint meeting between four physics societies: the American Physical Society, the Optical Society of America, the Acoustical Society of America, and the Society of Rheology. These were soon joined by the American Association of Physics Teachers, for a total of five societies. It formally incorporated in 1932 consisting of five original "member so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Astronomical Society
The American Astronomical Society (AAS, sometimes spoken as "double-A-S") is an American society of professional astronomers and other interested individuals, headquartered in Washington, DC. The primary objective of the AAS is to promote the advancement of astronomy and closely related branches of science, while the secondary purpose includes enhancing astronomy education and providing a political voice for its members through lobbying and grassroots activities. Its current mission is to enhance and share humanity's scientific understanding of the universe as a diverse and inclusive astronomical community. History The society was founded in 1899 through the efforts of George Ellery Hale. The constitution of the group was written by Hale, George Comstock, Edward Morley, Simon Newcomb and Edward Charles Pickering. These men, plus four others, were the first Executive Council of the society; Newcomb was the first president. The initial membership was 114. The AAS name of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
