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Astronomical Society of Southern Africa

  1. The Astronomical Society of Southern Africa is a largely amateur organization with significant professional membership.

Night Sky

  1. BinoSky - best bets for viewing the night sky through binoculars ( BinoSky ) A guide to the best bets for viewing the night sky through binoculars.
  2. Garstang, R.H. 1985, Brightness of the Denver night sky glow by comparison with moonlight, Announcer, American Association of Physics Teachers, 15, no.
  3. An Fraser Cain When you look into the night sky with your eyes, or through a telescope, you're seeing the Universe in the spectrum of visible light.


  1. NADIR: The point opposite the Zenith directly below the observer through the centre of the Earth, not to be confused with the Immum Coeli.
  2. Nadir: The direction from a spacecraft directly down toward the center of a planet.
  3. Nadir: the point on the celestial sphere diametrically opposite to the zenith.
  4. The nadir is the direction straight down, at altitude -90-.
  5. The nadir is the point directly below an observer.


  1. Triangulum is the gate of ascension through the initiation of the fire of sidereal Aries.


  1. The zenith is the point directly above the observer's head, at the top of the celestial sphere.
  2. The zenith is the point directly above the observers head, at the top of the celestial sphere.
  3. The zenith is the point directly overhead for a particular observer.
  4. The zenith is the point directly overhead.
  5. The zenith is the point in the sky directly overhead.

Solar Cycle

  1. The solar cycle is the period after which weekdays and calendar dates repeat in the Julian calendar.
  2. The solar cycle is the roughly 11-year, quasi-periodic variation in the frequency or number of sunspots, solar flares, and other solar activity.

Ring Nebula

  1. A ring nebula is a huge cloud of dust and gas that is shaped like a ring.
  2. The Ring Nebula is the most viewed of all the planet aries.

Rotation Period

  1. Mars has an axial tilt and a rotation period similar to those of Earth.
  2. Petr Pravec and Lenka Sarounova of Ondrejov posted some lightcurve results showing the rotation period of 2000 PH5 derived from the 2001 observations.
  3. Pluto has a rotation period of 6.39 days and an eccentricity of 0.248.

Rotation Curve

  1. The rotation curve is a plot of the orbital velocity of the clouds around the galactic center vs.

Orion Arm

  1. The Orion Arm is a minor spiral arm of the Milky Way galaxy.

Limiting Magnitude

  1. Limiting magnitude is the faintest apparent magnitude detectable or detected by a given instrument.
  2. Limiting magnitude is used eg.
  3. Limiting magnitude is used to evaluate the quality of observing conditions.
  4. The limiting magnitude is the magnitude of the dimmest star that you can see by the zenith (overhead).

Geocentric Orbit

  1. Geocentric Orbit - An orbit around the planet Earth, such as the Moon or artificial satellites.

Equatorial Ridge

  1. In fact the asteroid is spinning so fast that the equatorial ridge is very close to lifting off the surface and spinning into space, he said.
  2. Citation: Ip, W.-H. ( 2006), On a ring origin of the equatorial ridge of Iapetus, Geophys.

Elliptic Orbit

  1. Elliptic Orbit - An orbit with an eccentricity greater than 0 and less than 1 whose orbit traces the path of an ellipse.


  1. DECLINATION: The angular distance measured in degrees north and south of the CELESTIAL EQUATOR defined as 00.
  2. Declination - The angular distance of a celestial body north or south of the celestial equator.
  3. Declination is a celestial coordinate that is used to measure the degrees of latitude above or below the celestial equator on the celestial sphere.
  4. Declination is a north-south value similar to latitude on Earth.
  5. Declination is the angular distance measured in degrees, of a celestial body north or south of the celestial equator.

Accretion Theory

  1. It's recently been revived because of problems with the core accretion theory.
  2. The simulation shows that a protostar, once formed, cannot accrete much more gas from the surrounding clump, contradicting the competitive accretion theory.


  1. Achondrite - A meteorite consisting of igneous minerals and no chondrules, very similar to terrestrial igneous rocks.
  2. Achondrite: A class of stony meteorite s that crystallized from magma s.
  3. Achondrite: A class of stony meteorites that crystallized from magmas.
  4. An Achondrite is a stony meteorite that is made of material similar to terrestrial basalts or plutonic rocks.

Afocal Projection

  1. Afocal projection is a method that uses both the camera lens and the telescope eyepiece.
  2. Afocal projection is the method most commonly associated with digiscoping.

Air Glow

  1. Air glow is a term for light emitted from the upper layers of the atmosphere of Earth, or of another planet.


  1. Two stars which have the same almucantar have the same altitude.
  2. An almucantar (also called a "parallel of altitude") is a circle on the celestial sphere that is parallel to the horizon.


  1. Amphoterite is an obsolete term used to describe chondritic meteorites that are now classified as LL (Low Iron and Low total metal content) types.

Anaretic Degree

  1. An example of how the anaretic degree can pose problems is in horary astrology.
  2. In astrology, the anaretic degree is the final degree of any sign, which is 29 degrees 0 minutes to 29 degrees 59 minutes.
  3. Another area where the anaretic degree plays an important role is that in wedding charts.


  1. Apus is a dim constellation.
  2. Apus is a faint southern constellation, not visible to the ancient Greeks.
  3. Apus is one of the 15 circumpolar constellations in the southern hemisphere.
  4. Apus was created by the Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman, who charted the southern skies in 1595 - 1597.
  5. Apus was invented by Pieter Dirksz Keyser and Fredrick de Houtman sometime between 1595-1597.


  1. Quote from Steve Squyres: "Next piece of evidence comes from APXS. We found it looked like a lot of sulfur.
  2. APXS will be provided by the Canadian Space Agency.
  3. The first results from the APXS will be available almost immediately after landing.

Argument of Perigee

  1. The angle between these two lines is called the argument of perigee.
  2. The argument of perigee ω (small Greek omega).


  1. Astrochemistry is a basic introduction to the chemistry and physics of atmospheres other than Earth's.
  2. Astrochemistry is the study of chemistry in space.
  3. Astrochemistry: the study of the chemicals found in outer space, usually in molecular gas clouds, and their formation, interaction and destruction.

Astronomer Royal For Scotland

  1. He was Astronomer Royal for Scotland from 1905 to 1910, and Astronomer Royal (and director of the Royal Greenwich Observatory) from 1910 to 1933.
  2. In 1845 he was appointed astronomer royal for Scotland and professor of astronomy in the university of Edinburgh.

Astronomical Year Numbering

  1. All calendar dates given are in ISO 8601 form (Gregorian calendar with astronomical year numbering).
  2. Astronomical year numbering is used, thus 1 BC is 0, 2 BC is -1, and 4713 BC is -4712.

Astronomical Catalog

  1. Many astrophysical archives store their data in FITS format, and most astronomical catalog data has been transcribed into FITS files.
  2. The page also includes an astronomical catalog and press packets on the planets discovered by the observatory's astronomers.

Astronomical Journal

  1. Astronomical Journal is a monthly scientific journal published by the University of Chicago Press on behalf of the American Astronomical Society .
  2. The Astronomical Journal is a "society" journal, published by the (non-profit) American Astronomical Society and has an emphasis on observational astronomy.
  3. The Astronomical Journal is a monthly publication covering the field of astronomy.
  4. The Astronomical Journal is a monthly scientific journal published by the University of Chicago Press on behalf of the American Astronomical Society.

Atmospheric Refraction

  1. Atmospheric refraction is a very well documented phenomenon.

Besselian Epoch

  1. See precession.The "B" in the prefix indicates that it is a Besselian epoch, as opposed to a Julian epoch.
  2. The equinox value is interpreted as a Besselian epoch for the FK4 and FK4-NO-E systems and as a Julian epoch for the FK5 and ICRS systems.
  3. J2000.0 or 2000.0, or the equatorial mean place pre-IAU 1976 system (FK4) if equinox is a Besselian epoch, e.g.

Black Moon

  1. Black Moon is an album by progressive rock band Emerson, Lake & Palmer, released in 1992 (see 1992 in music).
  2. In Astrology, the term "black moon" can sometimes refer to Lilith, Earth's hypothetical second moon.

Book of Silk

  1. The Book of Silk is an ancient astronomy book made by Chinese astronomers around 400 BCE and found in a tomb in China in 1973.

Bootes Void

  1. The Bootes void is a tremendously large, nearly-empty region of space, devoid of galaxies.

Bow Shock

  1. A bow shock is a shock wave located where incoming solar wind meets a planet's magnetosphere, or magnetic bubble.
  2. A bow shock is a supersonic shock wave that is formed as the interacts with the outermost layer of a planet 's (or a highly conducting ionosphere).
  3. Bow shock is also a term used to describe the phenomenon produced during the interaction between the sun's solar wind and the earth's magnetic field.


  1. The Brahmasphutasiddhanta is the earliest known text other than the Mayan number system to treat zero as a number in its own right.

British Astronomical Association

  1. Formed in 1890, the British Astronomical Association has an international reputation for the quality of its observational and scientific work.
  2. The Campaign for Dark Skies (CfDS) is part of the British Astronomical Association, and campaigns for reduced light pollution in the United Kingdom.
  3. The British Astronomical Association, BAA, is the senior national association of amateur astronomers in the UK.

British Interplanetary Society

  1. The journal is edited and published in the United Kingdom by the British Interplanetary Society as a bi-monthly 72 page volume.
  2. The Journal_of_the_British_Interplanetary_Society (JBIS) is a technical scientific journal, first published in 1934.


  1. Brorsen was appointed a corresponding member of the nature historic society in --amberk in 1850.
  2. Personally, Brorsen was an introverted character with relationship anxieties.
  3. In 1854, Brorsen published the first thorough investigations of the so-called gegenschein (counter glow) of the Zodiacal light.


  1. Caelum was invented by Lacaille between 1751 and 1752 on his trip to the Cape of Good Hope.
  2. Caelum was named by the 18th century French astronomer Nicolas-Louis de Lacaille.

Cape York Meteorite

  1. Cape York meteorite: A huge iron meteorite that landed more than 1,000 years ago in Cape York, West Greenland.

Cassini Division

  1. Cassini Division - The Cassini Division is the main, dark division between Saturn's largest rings.
  2. The Cassini Division is a 4,800 km (2,980 mile) region between the A Ring and B Ring.
  3. The Cassini Division is a 4,800 km (2,980 mile) wide region between the A Ring and B Ring.
  4. The Cassini Division is a dark region between the A and B rings.
  5. The Cassini Division is the main, dark division between Saturn's largest rings (the A and B rings).

Catalina Sky Survey

  1. Larson and Catalina Sky Survey team member Ed Beshore worked on commissioning the Uppsala telescope during the past few months.
  2. When it comes to finding asteroids or comets that swing too close to home, the Catalina Sky Survey is currently Earth's best defense.
  3. The Catalina Sky Survey discovered more near-Earth objects (NEOs) than any other sky survey in 2005.

Celestial Equator

  1. Celestial Equator: The celestial equator is the line which projects from the Earth equator onto the celestial sphere.
  2. Celestial equator: An imaginary great circle in the sky drawn concentric to the Earth 's equator.
  3. Celestial equator: the plane perpendicular to the celestial ephemeris pole.
  4. The CELESTIAL EQUATOR is a great circle on the celestial sphere in the same plane of the earth's equator.
  5. The CELESTIAL EQUATOR is a projection of the earth's equator onto the sky.

Cfa Redshift Survey

  1. The CfA Redshift Survey was the first attempt to map the large-scale structure of the universe.

Related Keywords

    * Chamaeleon * Cheshire Moon * Chinese Astronomy * Circinus * Closed Universe * Cloud Pattern On Jupiter * Cold Trap * Color Index * Comet Boethin * Comet West * Constellation * Coronagraph * Corona Australis * Corona Borealis * Cosmological Decade * Cospar * Crescent Nebula * Cygnus Loop * Deep Ecliptic Survey * Deep Sky * Diffuse Nebula * Digiscoping * Dioptrics * Dudley Observatory * Dunsink Observatory * E-Vlbi * Eagle Nebula * Eccentric Jupiter * Egg Nebula * Egress * Einstein Cross * Electronic Imager * Equuleus * Escape Orbit * Evection * Explanation * Extragalactic Astronomy * Federation of Astronomical Societies * Fermi Acceleration * First Light * Fornax * General Catalogue * Giacobini-Zinner * Giacobinids * Gq Lupi B * Great Year * Guide Star Catalog * H-Alpha * Habcat * Half-Month * Harvard-Smithsonian Center For Astrophysics * Healpix * Heliocentric Orbit * Heliosheath * Historical Astronomy * Homunculus Nebula * Horologium * Horseshoe Orbit * Hubble Flow * Hydrus * Iau Circular * Icy Moon * Inclination Angle * Inner-Grazer * International Dark-Sky Association * Iraf * Islamic Astronomy * Jansky * Jive * Julian Epoch * Keeler Gap * Kelvin-Helmholtz Mechanism * Killing Horizon * Kraus-Type * Laplace Plane * Local Bubble * Local Fluff * Local Interstellar Cloud * Loop I Bubble * Lower Imbrian * Luminous Blue Variable * Lunar Conjunction * Lunar Distance * Lunar Year * Mean Longitude * Mean Motion * Metal-Rich * Metallicity * Michael Maestlin * Milliarcsecond * Mmt * Musca * Observatory * Octans * Open Universe * Outer-Grazer * Outer Planet * Parabolic Trajectory * Perseus Arm * Perseus Cluster * Pictor * Planetary Science * Planetary System * Planetesimal * Prime Vertical * Pulsar Planets * Puppis * Pyxis * Quadrantids * Radio Source * Ram Pressure * Redshift Survey * Reticulum * Rubble Pile * Sagittarius Arm * Secondary Mirror * Simbad * Skyglow * Small Telescope * Solar Constant * Solar Mass * Solar Minimum * Solar Tower * Spacecraft * Space Telescope Science Institute * Spectral Class * Spherical Astronomy * Spiral Nebula * Square Degree * Star Atlas * Star Hopping * Supernova * Telescopium * Triangulum Australe * Tucana * White Hole
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