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Ellen Dorrit Hoffleit
Ellen Dorrit Hoffleit (March 12, 1907 – April 9, 2007) was an American senior research astronomer at Yale University. She is best known for her work in variable stars, astrometry, spectroscopy, meteors, and the Bright Star Catalog. She is also known for her mentorship of many young women and generations of astronomers. Life Hoffleit's interest in astronomy began with the 1919 Perseid meteor shower that she saw with her mother. In 1928, she graduated cum laude with a B.A. in mathematics. She then went on to work for the Harvard College Observatory, searching for variable stars. In 1938, she was awarded a Ph.D. in astronomy from Radcliffe College and was subsequently hired, in 1948, as an astronomer at Harvard University. She remained at Harvard until 1956 when she moved to Yale University. She remained at Yale until retirement in 1975. At Yale she followed in the footsteps of Ida Barney, taking over her astrometric work, and of whom she later wrote "To know erwas a pleasure ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Florence, Alabama
Florence is a city in, and the county seat of, Lauderdale County, Alabama, Lauderdale County, Alabama, United States, in the state's northwestern corner, and had a population of 40,184 in the 2020 United States census, 2020 census. Florence is located along the Tennessee River and is home to the University of North Alabama, the oldest public college in the state. Florence is located about 70 miles west of Huntsville, Alabama, via U.S. Route 72, US-72, and about 115 miles northwest of Birmingham, Alabama. Florence is the largest and principal city of the "Quad Cities," more commonly known as "Florence–Muscle Shoals metropolitan area, The Shoals," which also includes the cities of Muscle Shoals, Alabama, Muscle Shoals, Sheffield, Alabama, Sheffield, and Tuscumbia, Alabama, Tuscumbia in Colbert County, Alabama, Colbert County and had a population of 148,779 as of the 2020 census. Florence is considered northwestern Alabama's primary economic hub. Annual tourism events include the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meteoroid
A meteoroid ( ) is a small rocky or metallic body in outer space. Meteoroids are distinguished as objects significantly smaller than ''asteroids'', ranging in size from grains to objects up to wide. Objects smaller than meteoroids are classified as ''micrometeoroids'' or ''space dust''. Many are fragments from comets or asteroids, whereas others are impact event, collision impact space debris, debris ejected from bodies such as the Moon or Mars. The visible passage of a meteoroid, comet, or asteroid atmospheric entry, entering Earth's atmosphere is called a meteor, and a series of many meteors appearing seconds or minutes apart and appearing to originate from the same fixed point in the sky is called a meteor shower. An estimated 25 million meteoroids, micrometeoroids and other space debris enter Earth's atmosphere each day, which results in an estimated 15,000 tonnes of that material entering the atmosphere each year. A ''meteorite'' is the remains of a meteoroid that has surv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kinematics
In physics, kinematics studies the geometrical aspects of motion of physical objects independent of forces that set them in motion. Constrained motion such as linked machine parts are also described as kinematics. Kinematics is concerned with systems of specification of objects' positions and velocities and mathematical transformations between such systems. These systems may be rectangular like Cartesian coordinate system, cartesian, Curvilinear coordinates like polar coordinates or other systems. The object trajectories may be specified with respect to other objects which may themselve be in motion relative to a standard reference. Rotating systems may also be used. Numerous practical problems in kinematics involve constraints, such as mechanical linkages, ropes, or rolling disks. Overview Kinematics is a subfield of physics and mathematics, developed in classical mechanics, that describes the motion of points, Physical object, bodies (objects), and systems of bodies (group ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The General Catalogue Of Trigonometric Stellar Parallaxes
A star catalogue is an astronomical catalogue that lists stars. In astronomy, many stars are referred to simply by catalogue numbers. There are a great many different star catalogues which have been produced for different purposes over the years, and this article covers only some of the more frequently quoted ones. Star catalogues were compiled by many different ancient people, including the Babylonians, Greeks, Chinese, Persians, and Arabs. They were sometimes accompanied by a star chart for illustration. Most modern catalogues are available in electronic format and can be freely downloaded from space agencies' data centres. The largest is being compiled from the spacecraft ''Gaia'' and thus far has over a billion stars. Completeness and accuracy are described by the faintest limiting magnitude V (largest number) and the accuracy of the positions. Historical catalogues Ancient Near East From their existing records, it is known that the ancient Egyptians recorded the n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bright Star Catalogue
The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars, Yale Bright Star Catalogue, or just YBS, is a star catalogue that lists all stars of stellar magnitude 6.5 or brighter, which is roughly every star visible to the naked eye from Earth. The catalog lists 9,110 objects, of which 9,095 are stars, 11 are novae or supernovae (which were "bright stars" only at the time when they were at their peak), and four are non-stellar objects which are the globular clusters 47 Tucanae (designated HR 95) and NGC 2808 (HR 3671), and the open clusters NGC 2281 (HR 2496) and Messier 67 (HR 3515). The catalogue is fixed in number of entries, but its data is maintained, and it is appended with a comments section about the objects that has been steadily enhanced. The abbreviation for the catalog as a whole is BS or YBS but all citations of stars it indexes use HR before the catalog number, a homage to the catalog's direct predecessor, published ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Army Ordnance Corps
The United States Army Ordnance Corps, formerly the United States Army Ordnance Department, is a Combat service support (United States), sustainment branch of the United States Army, headquartered at Fort Gregg-Adams, Fort Gregg-Adams, Virginia. The broad mission of the Ordnance Corps is to supply Army combat units with weapons and ammunition, including at times, their procurements and maintenance. Along with the Quartermaster Corps (United States Army), Quartermaster Corps and Transportation Corps, it forms a critical component of the U.S. Army logistics system. The U.S. Army Ordnance Corps mission is to support the development, production, acquisition, and sustainment of weapon systems, ammunition, missiles, electronics, and ground mobility materiel during peace and war to provide combat power to the U.S. Army. The officer in charge of the branch for doctrine, training, and professional development purposes is the Chief of Ordnance of the United States Army, Chief of Ordnance ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doppler Effect
The Doppler effect (also Doppler shift) is the change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave. The ''Doppler effect'' is named after the physicist Christian Doppler, who described the phenomenon in 1842. A common example of Doppler shift is the change of pitch heard when a vehicle sounding a horn approaches and recedes from an observer. Compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recession. When the source of the sound wave is moving towards the observer, each successive cycle of the wave is emitted from a position closer to the observer than the previous cycle. Hence, from the observer's perspective, the time between cycles is reduced, meaning the frequency is increased. Conversely, if the source of the sound wave is moving away from the observer, each cycle of the wave is emitted from a position farther from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nantucket Island
Nantucket () is an island in the state of Massachusetts in the United States, about south of the Cape Cod peninsula. Together with the small islands of Tuckernuck and Muskeget, it constitutes the Town and County of Nantucket, a combined county/town government. Nantucket is the southeasternmost town in both Massachusetts and the New England region. The name "Nantucket" is adapted from similar Algonquian names for the island. Nantucket is a tourist destination and summer colony. Due to tourists and seasonal residents, the population of the island increases to around 80,000 during the summer months. The average sale price for a single-family home was $2.3 million in the first quarter of 2018. The National Park Service cites Nantucket, designated a National Historic Landmark District in 1966, as being the "finest surviving architectural and environmental example of a late 18th- and early 19th-century New England seaport town." History Etymology Nantucket probably takes ... [...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] |
Ida Barney
Ida Barney (November 6, 1886 – March 7, 1982) was an American astronomer, best known for her 22 volumes of astrometric measurements on 150,000 stars. She was educated at Smith College and Yale University and spent most of her career at the Yale University Observatory. She was the 1952 recipient of the Annie J. Cannon Award in Astronomy. Early life Barney was born on November 6, 1886, in New Haven, Connecticut. Her mother was Ida Bushnell Barney and her father was Samuel Eben Barney. She was an avid birder and the New Haven Bird Club President. After her retirement from Yale, she continued to live in New Haven, where she died on March 7, 1982, 95 years old. Education In 1908, Barney was graduated from Smith College with a Bachelor of Arts degree. There, she was a member of Phi Beta Kappa and Sigma Xi, national honor societies for students. Three years later, she received her Ph.D. in mathematics from Yale University. Scientific career From 1911–1912, just after receivin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The New York Times
''The New York Times'' (''NYT'') is an American daily newspaper based in New York City. ''The New York Times'' covers domestic, national, and international news, and publishes opinion pieces, investigative reports, and reviews. As one of the longest-running newspapers in the United States, the ''Times'' serves as one of the country's Newspaper of record, newspapers of record. , ''The New York Times'' had 9.13 million total and 8.83 million online subscribers, both by significant margins the List of newspapers in the United States, highest numbers for any newspaper in the United States; the total also included 296,330 print subscribers, making the ''Times'' the second-largest newspaper by print circulation in the United States, following ''The Wall Street Journal'', also based in New York City. ''The New York Times'' is published by the New York Times Company; since 1896, the company has been chaired by the Ochs-Sulzberger family, whose current chairman and the paper's publ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Latin Honors
Latin honors are a system of Latin phrases used in some colleges and universities to indicate the level of distinction with which an academic degree has been earned. The system is primarily used in the United States. It is also used in some Southeastern Asian countries with European colonial history, such as Indonesia and the Philippines, and African countries such as Zambia and South Africa, although sometimes translations of these phrases are used instead of the Latin originals. The honors distinction should not be confused with the honors degrees offered in some countries, or with honorary degrees. The system usually has three levels of honor (listed in order of increasing merit): ''cum laude'', ''magna cum laude'', and ''summa cum laude''. Generally, a college or university's regulations set out definite criteria a student must meet to obtain a given honor. For example, the student might be required to achieve a specific grade point average, submit an honors thesis for evalu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
