Encyclopedia - Astronomy: Encyclopedia - Astronomy
Astronomy (Greek: αστρονομία = άστρον + νόμος, astronomia = astron + nomos, literally, "law of the stars") is the sc...   » Read the article

Encyclopedia - Astronomy: Encyclopedia Ii - Astronomy - History Of Astronomy
In early times, astronomy only comprised the observation and predictions of the motions of the naked-eye objects. Aristotle said that the...   » Read the article

Encyclopedia - History Of Astronomy: Encyclopedia Ii - History Of Astronomy - Modern Astronomy
At the end of the 19th century it was discovered that, when decomposing the light from the sun, a multitude of spectral lines were observ...   » Read the article

Encyclopedia - Astronomy Magazine: Encyclopedia - Astronomy Magazine
Astronomy is a monthly American magazine dealing with issues about astronomy. Targetting amateur astronomers for its readers, it contains...   » Read the article

Encyclopedia - Astronomy Day: Encyclopedia - Astronomy Day
Astronomy Day is an annual event intended to provide a means of interaction between the general public and various astronomy enthusiasts,...   » Read the article

Encyclopedia - Uv Astronomy: Encyclopedia - Uv Astronomy
UV astronomy is the branch of astronomy and astrophysics which deals with objects visible in ultraviolet (UV) radiation. UV radiation ran...   » Read the article

Encyclopedia - Rotation: Encyclopedia Ii - Rotation - Astronomy
In astronomy, rotation is a commonly observed phenomenon. Stars, planets and similar bodies all rotate around their axes, while planets a...   » Read the article

Encyclopedia - Syzygy: Encyclopedia Ii - Syzygy - Astronomy
In astronomy, a syzygy (Greek: "yoked together") is a situation where three celestial bodies are positioned along a straight line. The wo...   » Read the article

Encyclopedia - Anton Pannekoek: Encyclopedia Ii - Anton Pannekoek - Astronomy
In his scientific work, Pannekoek started studying the distribution of stars through the Milky Way, as well as the structure of our galax...   » Read the article

Encyclopedia - Autumnal Equinox: Encyclopedia Ii - Autumnal Equinox - Astronomy
The Celestial Equator and the Ecliptic are two Great Circles. As such, they intersect at two points, the Equinoxes. When the Sun, which m...   » Read the article

Encyclopedia - Zodiac: Encyclopedia Ii - Zodiac - Astronomy
In astronomy, the zodiac is the region of the sky close to the circle on which the orbital plane of our solar system intersects the celes...   » Read the article

Encyclopedia - Wilhelm Beer: Encyclopedia Ii - Wilhelm Beer - Astronomy
Beer's fame derives from his hobby, astronomy. He built a private observatory with a 9.5 cm refractor in Tiergarten, Berlin. Together wit...   » Read the article

Encyclopedia - Anagram: Encyclopedia Ii - Anagram - Astronomy
Perhaps the only practical use to which anagrams have been turned is to be found in the transpositions in which some of the astronomers o...   » Read the article

Encyclopedia - The Little Prince: Encyclopedia Ii - The Little Prince - Astronomy
In 2003, a small asteroid moon, Petit-Prince (discovered in 1998), was named after the Little Prince's inspiration, Empress Eugénie's an...   » Read the article

Encyclopedia - Cycle Studies: Encyclopedia Ii - Cycle Studies - Astronomy
Although weather changes from one summer to the next and from one winter to the next, the astronomical cycles that cause seasonal changes...   » Read the article

Encyclopedia - Window Astronomy: Encyclopedia - Window Astronomy
Astronomical window: In astronomy, an atmosphere can have a window for portions of the electromagnetic spectrum; that is, those wavelengt...   » Read the article

Encyclopedia - Astronomy: Encyclopedia Ii - Astronomy - Divisions
In ancient Greece and other early civilizations, astronomy consisted largely of astrometry, measuring positions of stars and planets in t...   » Read the article

Encyclopedia - Altitude Astronomy: Encyclopedia - Altitude Astronomy
In astronomy and surveying, altitude (sometimes called elevation) is one of the two coordinates of the horizontal coordinate system, and ...   » Read the article

Encyclopedia - Amateur Astronomy: Encyclopedia - Amateur Astronomy
Amateur astronomy, often called back yard astronomy, is a hobby whose participants enjoy observing celestial objects. It is usually assoc...   » Read the article

Encyclopedia - Astrology And Astronomy: Encyclopedia - Astrology And Astronomy
Astrology and astronomy were deeply intertwined in the past, and very much one and the same throughout the overwhelming bulk of human his...   » Read the article

Encyclopedia - Chinese Astronomy: Encyclopedia - Chinese Astronomy
The book Gan Shi Xing Jing (甘石星经) of the Warring States Period (403 BC to 221 BC) is the earliest catalog of stars in the world. ...   » Read the article

Encyclopedia - Conjunction Astronomy: Encyclopedia - Conjunction Astronomy
Conjunction is a term used in positional astronomy and astrology. It means that, as seen from some place (usually the Earth), two celesti...   » Read the article

Encyclopedia - Asterism Astronomy: Encyclopedia - Asterism Astronomy
In astronomy, an asterism is a pattern of stars seen in Earth's sky which is not an official constellation. Like constellations, they are...   » Read the article

Encyclopedia - Astronomy On Mars: Encyclopedia - Astronomy On Mars
Mars has an axial tilt of 25.2°, quite close to the value of 23.45° for Earth, and thus Mars has seasons of spring, summer, autumn, win...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia - Aurora Astronomy
The polar aurora is a glow observed in the night sky in the polar zone. It is also known as "northern lights" or "aurora borealis," Latin...   » Read the article

Encyclopedia - Hindu Astronomy: Encyclopedia - Hindu Astronomy
Please remove this notice after the article has been expanded. Details are on this talk page or at Wikipedia:Requests for expansion. The ...   » Read the article

Encyclopedia - Opposition Astronomy: Encyclopedia - Opposition Astronomy
Opposition is a term used in positional astronomy and astrology to indicate when one celestial body is on the opposite side of the sky wh...   » Read the article

Encyclopedia - Correlation Function Astronomy: Encyclopedia - Correlation Function Astronomy
Astronomers describe the distribution of galaxies in the universe by means of a correlation function. By default, correlation function re...   » Read the article

Encyclopedia - Visible Light Astronomy: Encyclopedia - Visible Light Astronomy
Visible light astronomy encompasses a wide variety of observations via telescopes that are sensitive in the range of visible light. It in...   » Read the article

Encyclopedia - Binary System Astronomy: Encyclopedia - Binary System Astronomy
A binary system is an astronomy term referring to two objects in space, usually stars, which are so close that their gravitational forces...   » Read the article

Encyclopedia - X-ray Astronomy: Encyclopedia - X-ray Astronomy
X-ray astronomy is an observational branch of astronomy, which deals with the study of X-ray emission from celestial objects. X-ray radia...   » Read the article

Encyclopedia - Association Of Universities For Research In Astronomy: Encyclopedia - Association Of Universities For Research In Astronomy
The Association of Universities for Research in Astronomy (AURA) is a consortium of universities and other institutions. It operates astr...   » Read the article

Encyclopedia - Sea Astronomy: Encyclopedia - Sea Astronomy
The Sea is the name early greeks, and many later astronomers, gave to an area of the sky in which many water-related, and very few land-r...   » Read the article

Encyclopedia - Amateur Astronomy: Encyclopedia Ii - Amateur Astronomy - Beginning In Amateur Astronomy
There are a many ways for people to become involved in amateur astronomy and study the night sky. One option is to join a local astronomi...   » Read the article

Encyclopedia - Amateur Astronomy: Encyclopedia Ii - Amateur Astronomy - Societies For Amateur Astronomy
There are a large number of amateur astronomical societies around the world that serve as a meeting point for those interested in amateur...   » Read the article

Encyclopedia - History Of Astronomy: Encyclopedia Ii - History Of Astronomy - Mesopotamia
History of astronomy - Sumer. History of astronomy - Chaldea Babylonia. ... See also:History of astronomy, History of astronomy - A...   » Read the article

Encyclopedia - History Of Astronomy: Encyclopedia Ii - History Of Astronomy - Mesoamerica
History of astronomy - Maya civilization. The Maya calculated the solar year to somewhat greater accuracy than the Gregorian calendar. ...   » Read the article

Encyclopedia - Biblical Astronomy: Encyclopedia Ii - Biblical Astronomy - Ancient Conception Of Astronomy
Biblical astronomy - In the Talmud. The study of the universe as a whole was, like all other sciences in olden times, held in closest c...   » Read the article

Encyclopedia - History Of Astronomy: Encyclopedia Ii - History Of Astronomy - India
See also: Hindu astronomy There are astronomical references of chronological significance in the Vedas. Some Vedic notices mark the begin...   » Read the article

Encyclopedia - Amateur Astronomy: Encyclopedia Ii - Amateur Astronomy - Amateur Astronomy And Scientific Research
Unlike professional astronomy, scientific research is not always the main goal for many amateur astronomers. Work of scientific merit is ...   » Read the article

Encyclopedia - Terebellum Astronomy: Encyclopedia Ii - Terebellum Astronomy - ω Sagittarii
Omega Sagittarii is a spectral type G5 giant with an apparent magnitude of +4.74. At 77.6 light years from Earth, it is the nearest of th...   » Read the article

Encyclopedia - Observational Astronomy: Encyclopedia Ii - Observational Astronomy - Telescopes
Galileo Galilei was the first person to known to turn a telescope to the heavens and to record what he saw. Since that time, observationa...   » Read the article

Encyclopedia - Observational Astronomy: Encyclopedia Ii - Observational Astronomy - Observing
A variety of data can be observed for each star. The position coordinates locate the star on the sky using the techniques of spherical as...   » Read the article

Encyclopedia - Radio Astronomy: Encyclopedia Ii - Radio Astronomy - Developments
Radio astronomy has led to substantial increases in astronomical knowledge, particularly with the discovery of several classes of new obj...   » Read the article

Encyclopedia - Islamic Astronomy: Encyclopedia Ii - Islamic Astronomy - Observatories
The first systematic observations in Islam are reported to have taken place under the patronage of al-Mamun. Here, and in many other priv...   » Read the article

Encyclopedia - Infrared Astronomy: Encyclopedia Ii - Infrared Astronomy - Modern Infrared Astronomy
Near infrared radiation (infrared radiation with wavelengths close to that of visible light) behaves in a very similar way to visible lig...   » Read the article

Encyclopedia - Submillimetre Astronomy: Encyclopedia Ii - Submillimetre Astronomy - Submillimetre Astronomy From Space
Space-based observations at the submillimetre wavelengths remove the ground-based limitations of atmospheric absorption. The Submillimete...   » Read the article

Encyclopedia - History Of Astronomy: Encyclopedia Ii - History Of Astronomy - Ancient History
Early cultures identifed celestial objects with gods and spirits. They related these objects (and their movements) to phenomena such as r...   » Read the article

Encyclopedia - Astronomy On Mars: Encyclopedia Ii - Astronomy On Mars - Seasons
Mars has an axial tilt of 25.2°, quite close to the value of 23.45° for Earth, and thus Mars has seasons of spring, summer, autumn, win...   » Read the article

Encyclopedia - History Of Astronomy: Encyclopedia Ii - History Of Astronomy - East Asia
History of astronomy - China. Ancient Chinese Astronomy dates back before Christ. Chinese Astronomers were to be able to predict comets...   » Read the article

Encyclopedia - Asterism Astronomy: Encyclopedia Ii - Asterism Astronomy - Background
The visible stars are located at random in the sky. Even before the dawn of civilization, it became common to clump various stars togethe...   » Read the article

Encyclopedia - History Of Astronomy: Encyclopedia Ii - History Of Astronomy - Middle Ages
Greeks made some important contributions to astronomy, but the progress was mostly stagnant in medieval Europe, while it flourished in th...   » Read the article

Encyclopedia - Radio Astronomy: Encyclopedia Ii - Radio Astronomy - History
Nikola Tesla in the Colorado Springs lab recorded cosmic waves emitting from interstellar clouds and red giant stars. He observed repeati...   » Read the article

Encyclopedia - History Of Astronomy: Encyclopedia Ii - History Of Astronomy - The Copernican Revolution
The renaissance came to astronomy with the work of Copernicus, who proposed a heliocentric system. His work was defended, expanded upon a...   » Read the article

Encyclopedia - Terebellum Astronomy: Encyclopedia Ii - Terebellum Astronomy - 60 Sagittarii
60 Sagittarii, or A Sagittarii, is a spectral type G8 bright giant, and the dimmest of the Terebellum, with an apparent magnitude of +4.8...   » Read the article

Encyclopedia - Conjunction Astronomy: Encyclopedia Ii - Conjunction Astronomy - Grand Conjunctions
Conjunction astronomy - 2007. A very remarkable planetary/galactic configuration occurs on 23rd and 24 December 2007. The 23/12 configu...   » Read the article

Encyclopedia - Conjunction Astronomy: Encyclopedia Ii - Conjunction Astronomy - Grand Conjunctions
Conjunction astronomy - 2007. A very remarkable planetary/galactic configuration occurs on 23rd and 24 December 2007. The 23/12 configu...   » Read the article

Encyclopedia - Biblical Astronomy: Encyclopedia Ii - Biblical Astronomy - Biblical Data
Biblical Astronomy, in the broad sense, includes the views taken in the books of the Bible of the position of the earth in the universe, ...   » Read the article

Encyclopedia - Conjunction Astronomy: Encyclopedia Ii - Conjunction Astronomy - Superior And Inferior
As seen from a planet that is superior, if an inferior planet is on the opposite side of the Sun, it is in superior conjunction with the ...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - Frequency Of Occurrence
Aurora is a common occurrence in the ring-shaped zone. it is occassionaly seen in temperate latitudes, when a strong magnetic storm tempo...   » Read the article

Encyclopedia - Observational Astronomy: Encyclopedia Ii - Observational Astronomy - Other Instruments
In addition to examination of the universe in the optical spectrum, astronomers have increasingly been able to acquire information in oth...   » Read the article

Encyclopedia - Astronomy On Mars: Encyclopedia Ii - Astronomy On Mars - Astronomical Phenomena
Astronomy on Mars - Earth and Moon. As seen from Mars, the Earth is an inner planet like Venus (a "morning star" or "evening star"). Th...   » Read the article

Encyclopedia - Observational Astronomy: Encyclopedia Ii - Observational Astronomy - Observation Tools
The key instrument of nearly all modern observational astronomy is the telescope. This serves the dual purposes of gathering more light s...   » Read the article

Encyclopedia - Terebellum Astronomy: Encyclopedia Ii - Terebellum Astronomy - 59 Sagittarii
59 Sagittarii, also known by its Bayer designation b¹ Sagittarii, has an apparent magnitude of +4.54. It is a spectral type K3 giant at ...   » Read the article

Encyclopedia - Asterism Astronomy: Encyclopedia Ii - Asterism Astronomy - Former Asterisms
Argo is a special case. By far the largest of Ptolemy's constellations was Argo Navis (the ship Argo). Starting with Lacaille in his Coel...   » Read the article

Encyclopedia - Astronomy On Mars: Encyclopedia Ii - Astronomy On Mars - The Color Of The Sky
Around sunset and sunrise the Martian sky is pinkish-red in color, but in the vicinity of the setting sun it is blue. This is the exact ...   » Read the article

Encyclopedia - Amateur Astronomy: Encyclopedia Ii - Amateur Astronomy - Additional Tools And Activities
In addition to optical equipment, amateur astronomers use a variety of other tools such as celestial maps, and specialised computer softw...   » Read the article

Encyclopedia - Observational Astronomy: Encyclopedia Ii - Observational Astronomy - Unaided Eye
Prior to the discovery of the telescope, early observational astronomy relied upon the unaided eye and various instruments for measuring ...   » Read the article

Encyclopedia - Astrology And Astronomy: Encyclopedia Ii - Astrology And Astronomy - Historical Divergence
The primary goal of astronomy is to understand the physics of the universe. Astrologers use astronomical calculations for the positions o...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - Auroral Mechanism
Aurora is now known to be caused by electrons of typical energy of 1-15 keV, i.e. the energy obtained by the electrons passing through a ...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - Auroral Sounds
Throughout history people have written and spoken of sounds associated with auroral displays, often describing them as crackling, hissing...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - Auroral Sounds
Throughout history people have written and spoken of sounds associated with auroral displays, often describing them as crackling, hissing...   » Read the article

Encyclopedia - Observational Astronomy: Encyclopedia Ii - Observational Astronomy - Optical Telescopes
For much of the history of observational astronomy, almost all observation has been performed in the visual spectrum with optical telesco...   » Read the article

Encyclopedia - Provisional Designation In Astronomy: Encyclopedia Ii - Provisional Designation In Astronomy - Asteroids
The current system of provisional designation of asteroids has been in place since 1925, and superseded several previous conventions, eac...   » Read the article

Encyclopedia - History Of Astronomy: Encyclopedia Ii - History Of Astronomy - Cosmology And The Expansion Of The Universe
Most of our current knowledge was gained during the 20th century. With the help of the use of photography, fainter objects were observed....   » Read the article

Encyclopedia - Asterism Astronomy: Encyclopedia Ii - Asterism Astronomy - Other Examples
Undoubtedly, the best-known asterism is the Big Dipper. Composed of the seven brightest stars in Ursa Major where they delineate the Bear...   » Read the article

Encyclopedia - Extinction Astronomy: Encyclopedia Ii - Extinction Astronomy - Interstellar Extinction
Broadly speaking, interstellar extinction varies with wavelength in a way which is generally surprisingly uniform along different lines o...   » Read the article

Encyclopedia - History Of Astronomy: Encyclopedia Ii - History Of Astronomy - New Windows Into The Cosmos Open
Late in the 19th century, scientists began discovering forms of light which were invisible to the naked eye: X-Rays, gamma rays, radio wa...   » Read the article

Encyclopedia - Provisional Designation In Astronomy: Encyclopedia Ii - Provisional Designation In Astronomy - Comets
The system used previous to 1995 was complex. The year was followed by a space and then a Roman numeral in most cases, but difficulties a...   » Read the article

Encyclopedia - Amateur Astronomy: Encyclopedia Ii - Amateur Astronomy - Approaches To Using Amateur Telescopes
Amateur telescopes come in many shapes and sizes, both commercial and home-built. The preferences of people who use them often differ. A...   » Read the article

Encyclopedia - Biblical Astronomy: Encyclopedia Ii - Biblical Astronomy - In Post-talmudic Times
With the revival of Greek science which took place in Islam, Jews were intimately connected, and the Almagest is said to have been transl...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - Auroras On Other Planets
Both Jupiter and Saturn have magnetic fields much stronger than Earth's (Uranus, Neptune and Mercury are also magnetic), and both have la...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - Auroral Forms And Magnetism
Typically the aurora appears either as a diffuse glow or as "curtains" that approximately extend in the east-west direction. At some time...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - The Solar Wind And Magnetosphere
The Earth is constantly immersed in the solar wind, a rarefied flow of hot [[1]] plasma (gas of free electrons and positive ions) emitted...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - Sources And Types Of Aurora
Again, our understanding is very incomplete. A rough guess may point out three main sources: Dynamo action with the solar wind flowing p...   » Read the article

Encyclopedia - Infrared Astronomy: Encyclopedia Ii - Infrared Astronomy - Astronomers' Infrared Spectrum
Infrared space telescopes such as Spitzer, IRAS, ISO and the forthcoming Herschel Space Observatory can observe across the almost all of ...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - Auroral Forms And Magnetism
Typically the aurora appears either as a diffuse glow or as "curtains" that approximately extend in the east-west direction. At some time...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - Sources And Types Of Aurora
Again, our understanding is very incomplete. A rough guess may point out three main sources: Dynamo action with the solar wind flowing p...   » Read the article

Encyclopedia - Islamic Astronomy: Encyclopedia Ii - Islamic Astronomy - Celestial Passages In The Quran
Some Muslims quote verses from the Quran that show God encourages people, Muslims and non-Muslims alike, to engage in astronomy, in order...   » Read the article

Encyclopedia - Luminosity: Encyclopedia Ii - Luminosity - In Astronomy
In astronomy, luminosity is the amount of energy a body radiates per unit time. It is typically expressed in the SI units watts, in the c...   » Read the article

Encyclopedia - Conjunction Astronomy: Encyclopedia Ii - Conjunction Astronomy - Conjunctions Of Planets In Right Ascension 2005-2020
Conjunction astronomy - 2005. Conjunction astronomy - 2006. Conjunction astronomy - 2007. Conjunction astronomy - 2008. Conjunc...   » Read the article

Encyclopedia - Julian Year Astronomy: Encyclopedia Ii - Julian Year Astronomy - Specifying And Naming Epochs
Note that Julian years in astronomy are purely a unit for measuring time intervals and durations, and are not used as any kind of calenda...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - Auroras On Other Planets
Both Jupiter and Saturn have magnetic fields much stronger than Earth's (Uranus, Neptune and Mercury are also magnetic), and both have la...   » Read the article

Encyclopedia - Aurora Astronomy: Encyclopedia Ii - Aurora Astronomy - The Solar Wind And Magnetosphere
The Earth is constantly immersed in the solar wind, a rarefied flow of hot [[1]] plasma (gas of free electrons and positive ions) emitted...   » Read the article

Encyclopedia - 98 Number: Encyclopedia Ii - 98 Number - In Astronomy
The Messier object M98, a magnitude 11.0 spiral galaxy in the constellation Coma Berenices. The New General Catalogue object NGC 98, a ma...   » Read the article

Encyclopedia - 99 Number: Encyclopedia Ii - 99 Number - In Astronomy
Messier object M99, a magnitude 10.5 spiral galaxy in the constellation Coma Berenices. The New General Catalogue object NGC 99, a magnit...   » Read the article

Encyclopedia - National Radio Astronomy Observatory: Encyclopedia Ii - National Radio Astronomy Observatory - Locations
National Radio Astronomy Observatory - Charlottesville Virginia. Headquarters. Located on the University of Virginia grounds. The North...   » Read the article

Encyclopedia - 100 Number: Encyclopedia Ii - 100 Number - In Astronomy
The Messier object M100, a magnitude 10.5 spiral galaxy in the constellation Coma Berenices. The New General Catalogue object NGC 100, a ...   » Read the article

Encyclopedia - X-ray Astronomy: Encyclopedia Ii - X-ray Astronomy - Astronomical Sources Of X-rays
Several types of astrophysical objects emit X-rays, from galaxy clusters, through black holes in active galactic nucleii, or AGN for shor...   » Read the article

Encyclopedia - Angle: Encyclopedia Ii - Angle - Angles In Astronomy
In astronomy, one can measure the angular separation of two stars by imagining two lines through the Earth, each one intersecting one of ...   » Read the article