32 relations: A Treatise on the Astrolabe, Antonín Bečvář, Apparent magnitude, Astronomy and Astrophysics, Auriga (constellation), Bortle scale, Boss General Catalogue, Bright giant, Bright Star Catalogue, Brown dwarf, Catalogues of Fundamental Stars, Constellation, Coronal loop, Durchmusterung, Earth, Effective temperature, Erg, Extinction (astronomy), Five Chariots, Geoffrey Chaucer, Henry Draper Catalogue, Hipparcos, Monthly Notices of the Royal Astronomical Society, Parallax, Santorini, Smithsonian Astrophysical Observatory Star Catalog, Spectrum, Star, Stellar classification, Stellar evolution, Substellar object, Variable star.
A Treatise on the Astrolabe is a medieval instruction manual on the astrolabe by Geoffrey Chaucer.
Antonín Bečvář (10 June 1901 – 10 January 1965) was a Czech astronomer who was active in Slovakia.
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The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.
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Astronomy and Astrophysics is a peer-reviewed scientific journal covering theoretical, observational, and instrumental astronomy and astrophysics.
Auriga is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy and remains one of the 88 modern constellations.
The Bortle scale is a nine-level numeric scale that measures the night sky's brightness of a particular location.
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Boss General Catalogue (GC, sometimes General Catalogue) is an astronomical catalogue containing 33,342 stars.
The luminosity class II in the Yerkes spectral classification is given to bright giants.
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The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars or Yale Bright Star Catalogue, 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.
Brown dwarfs are substellar objects not massive enough to sustain hydrogen-1 fusion reactions in their cores, unlike main-sequence stars.
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The Catalogue of Fundamental Stars is a series of six astrometric catalogues of high precision positional data for a small selection of stars to define a celestial reference frame, which is a standard coordinate system for measuring positions of stars.
In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU).
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Coronal loops form the basic structure of the lower corona and transition region of the Sun.
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In astronomy, Durchmusterung or Bonner Durchmusterung (BD), is the comprehensive astrometric star catalogue of the whole sky, compiled by the Bonn Observatory (Germany) from 1859 to 1903.
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Earth (also the world, in Greek: Gaia, or in Latin: Terra), is the third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to accommodate life.
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The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation.
The erg is a unit of energy and work equal to 10−7 joules.
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Extinction is a term used in astronomy to describe the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.
Five Chariots (五車, pinyin: Wǔ Ju) is a constellation in Chinese astronomy.
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Geoffrey Chaucer (c. 1343 – 25 October 1400), known as the Father of English literature, is widely considered the greatest English poet of the Middle Ages and was the first poet to be buried in Poets' Corner of Westminster Abbey.
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The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars.
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
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Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
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Santorini (Σαντορίνη, pronounced), classically Thera (English pronunciation), and officially Thira (Greek: Θήρα), is an island in the southern Aegean Sea, about southeast of Greece's mainland.
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The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary infinitely within a continuum.
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A star is a luminous sphere of plasma held together by its own gravity.
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In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
Stellar evolution is the process by which a star changes during its lifetime.
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A substellar object, sometimes called a substar, is an astronomical object whose mass is smaller than the smallest mass at which hydrogen fusion can be sustained (approximately 0.08 solar masses).
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A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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