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Geostationary Orbit
A geostationary orbit, also referred to as a geosynchronous equatorial orbit''Geostationary orbit'' and ''Geosynchronous (equatorial) orbit'' are used somewhat interchangeably in sources. (GEO), is a circular orbit, circular geosynchronous orbit in altitude above Earth's equator, in radius from Earth's center, and following the retrograde and prograde motion, direction of Earth's rotation. An object in such an orbit has an orbital period equal to Earth's rotational period, one sidereal time, sidereal day, and so to ground observers it appears motionless, in a fixed position in the sky. The concept of a geostationary orbit was popularised by the science fiction writer Arthur C. Clarke in the 1940s as a way to revolutionise telecommunications, and the first satellite to be placed in this kind of orbit was launched in 1963. Communications satellites are often placed in a geostationary orbit so that Earth-based satellite dish, satellite antennas do not have to rotate to track t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syncom 2 Side
Syncom (for "synchronous communication satellite") started as a 1961 NASA program for active geosynchronous communication satellites, all of which were developed and manufactured by the Space and Communications division of Hughes Aircraft Company (now the Boeing Satellite Development Center). Syncom 2, launched in 1963, was the world's first geosynchronous communications satellite. Syncom 3, launched in 1964, was the world's first geostationary satellite. In the 1980s, the series was continued as Syncom IV with some much larger satellites, also manufactured by Hughes. They were leased to the United States military under the Leasat program. Syncom 1, 2 and 3 Common features The three early Syncom satellites were experimental spacecraft built by Hughes Aircraft Company's facility in Culver City, California, by a team led by Harold Rosen, Don Williams, and Thomas Hudspeth. All three satellites were cylindrical in shape, with a diameter of about and a height of about . Pre- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High Frequency
High frequency (HF) is the ITU designation for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters). Frequencies immediately below HF are denoted '' medium frequency'' (MF), while the next band of higher frequencies is known as the '' very high frequency'' (VHF) band. The HF band is a major part of the shortwave band of frequencies, so communication at these frequencies is often called ''shortwave radio''. Because radio waves in this band can be reflected back to Earth by the ionosphere layer in the atmosphere – a method known as "skip" or "skywave" propagation – these frequencies can be used for long-distance communication across intercontinental distances and for mountainous terrains which prevent line-of-sight communications. The band is used by international shortwave broadcasting stations (3.95–25.8 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sputnik 1
Sputnik 1 (, , ''Satellite 1''), sometimes referred to as simply Sputnik, was the first artificial Earth satellite. It was launched into an elliptical low Earth orbit by the Soviet Union on 4 October 1957 as part of the Soviet space program. It sent a radio signal back to Earth for three weeks before its three silver-zinc batteries became depleted. Aerodynamic drag caused it to fall back into the atmosphere on 4 January 1958. It was a polished metal sphere in diameter with four external radio antennas to broadcast radio pulses. Its radio signal was easily detectable by amateur radio operators, and the 65° orbital inclination made its flight path cover virtually the entire inhabited Earth. The satellite's success was unanticipated by the United States. This precipitated the American Sputnik crisis and triggered the Space Race. The launch was the beginning of a new era of political, military, technological, and scientific developments. The word ''sputnik'' is Russian for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hughes Aircraft
The Hughes Aircraft Company was a major American aerospace company, aerospace and defense contractor founded on February 14, 1934 by Howard Hughes in Glendale, California, as a division of the Hughes Tool Company. The company produced the Hughes H-4 Hercules aircraft, the atmospheric entry probe carried by the Galileo (spacecraft), ''Galileo'' spacecraft, and the AIM-4 Falcon guided missile. Hughes Aircraft was founded to build Hughes' Hughes H-1 Racer, H-1 Racer world speed record aircraft, and later modified other aircraft for his transcontinental and global circumnavigation speed record flights. The company relocated to Culver City, California, in 1940 and began manufacturing aircraft parts as a subcontractor. Hughes attempted to mold it into a major military aircraft manufacturer during World War II. However, its early military projects ended in failure, with millions of dollars in U.S. government funds expended for only a handful of prototypes, resulting in a highly publiciz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harold Rosen (electrical Engineer)
Dr. Harold Allen Rosen (20 March 1926 – 30 January 2017) was an American electrical engineer, known as "the father of the geostationary satellite", and "father of the communications satellite". He formed and led the team that designed and built the first geosynchronous communications satellite, Syncom, for Hughes Aircraft Company. Early life Harold Allen Rosen was born on March 20, 1926, in New Orleans, Louisiana. He served as a radio communication and radar technician in the U.S. Navy during World War II, from 1944 to 1946. His experiences in the Navy provided him with hands-on experience with radio communications and the then-new field of radars. He graduated from Tulane University in New Orleans in 1947 with a Bachelor of Engineering degree in electrical engineering. He received an M.S. and a PhD in electrical engineering in 1948 and 1951 respectively from the California Institute of Technology in Pasadena.Hagerty, James, Engineer launched commercial satrellite era, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NASA
The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United States government, independent agency of the federal government of the United States, US federal government responsible for the United States's civil list of government space agencies, space program, aeronautics research and outer space, space research. National Aeronautics and Space Act, Established in 1958, it succeeded the National Advisory Committee for Aeronautics (NACA) to give the American space development effort a distinct civilian orientation, emphasizing peaceful applications in space science. It has since led most of America's space exploration programs, including Project Mercury, Project Gemini, the 1968–1972 Apollo program missions, the Skylab space station, and the Space Shuttle. Currently, NASA supports the International Space Station (ISS) along with the Commercial Crew Program and oversees the development of the Orion (spacecraft), Orion spacecraft and the Sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wireless World
''Electronics World'' (''Wireless World'', founded in 1913, and in October 1983 renamed ''Electronics & Wireless World'') is a technical magazine published by Datateam Business Media Ltd that covers electronics and RF engineering and is aimed at professional design engineers. It is produced monthly in print and digital formats. The editorial content of ''Electronics World'' covers the full range of electronics and RF industry activities including technology, systems, components, design, development tools, software, networking, communications tools and instrumentation. It encompasses a range of issues in the electronics and RF industry, from design through to product implementation. The features are contributed by engineers and academics in the electronics industry. The circulation is split between electronic design engineers, senior managers, and R&D professionals within areas such as communications, manufacturing, education and training, IT, medical, power, oil and gas. Histor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science Fiction
Science fiction (often shortened to sci-fi or abbreviated SF) is a genre of speculative fiction that deals with imaginative and futuristic concepts. These concepts may include information technology and robotics, biological manipulations, space exploration, time travel, Parallel universes in fiction, parallel universes, and extraterrestrials in fiction, extraterrestrial life. The genre often explores human responses to the consequences of projected or imagined scientific advances. Science fiction is related to fantasy (together abbreviated wikt:SF&F, SF&F), Horror fiction, horror, and superhero fiction, and it contains many #Subgenres, subgenres. The genre's precise Definitions of science fiction, definition has long been disputed among authors, critics, scholars, and readers. Major subgenres include hard science fiction, ''hard'' science fiction, which emphasizes scientific accuracy, and soft science fiction, ''soft'' science fiction, which focuses on social sciences. Other no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ballantine Books
Ballantine Books is a major American book publisher that is a subsidiary of German media conglomerate Bertelsmann. Ballantine was founded in 1952 by Ian Ballantine with his wife, Betty Ballantine. Ballantine was acquired by Random House in 1973, which in turn was acquired by Bertelsmann in 1998 and remains part of that company. Ballantine's original logo was a pair of mirrored letter Bs back to back, later changing to two Bs stacked to form an elaborate gate. The firm's early editors were Stanley Kauffmann and Bernard Shir-Cliff. History Following Fawcett Publications' controversial 1950 introduction of Gold Medal paperback originals rather than reprints, Lion Books, Avon and Ace also decided to publish originals. In 1952, Ian Ballantine, a founder of Bantam Books, announced that he would "offer trade publishers a plan for simultaneous publishing of original titles in two editions, a hardcover 'regular' edition for bookstore sale, and a paper-cover, 'newsstand' size, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George O
George Ortuzar (born August 14, 1961), also known as George O, is a Cuban American actor, comedian, television host and sports agent, who is best known for his work on Univision, including hosting the shows ''Lente Loco'', ''La Piñata Loca'', and ''Giorgiomania''. Ortuzar has also appeared in several films and commercials, and was featured in advertisements promoting the Hollywood Park Racetrack, for which he served as the marketing manager during its last 12 years of operation. Since 2015, he has hosted the online sports show ''Better Sports News'' on YouTube. Career Television Ortuzar's career on television began in 1991, when he joined Univision after being discovered by production executives. After numerous appearances on ''Sabado Gigante'', he went on to become the host of ''Lente Loco'' in 1993, alongside Odalys Garcia. Years later, he starred in two children shows ''La Piñata Loca'' and ''Giorgiomania'', and has been featured in numerous commercials and infomercials over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Venus Equilateral
The Venus Equilateral series is a set of 13 science fiction short stories by American writer George O. Smith, concerning the Venus Equilateral Relay Station, an interplanetary communications hub located at the Lagrangian point of the Sun-Venus system. Most of the stories were first published in ''Astounding Science Fiction'' between 1942 and 1945. Venus Equilateral Relay Station The setting for most of the stories in the series is Venus Equilateral, a space station three miles long and one mile in diameter that serves as a communications relay between Venus, Earth, and Mars whenever interference from the Sun prevents line-of-sight communication between them. Venus Equilateral was formed out of a nickel-iron asteroid that was moved into Venus' point. At the time the stories take place, the asteroid has been completely reworked, resulting in a burnished steel cylinder with a large docking port at one end and a bank of communications dishes at the other. Venus Equilateral ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
