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- Astronomical_constant abstract "An astronomical constant is a physical constant used in astronomy. Formal sets of constants, along with recommended values, have been defined by the International Astronomical Union (IAU) several times: in 1964 and in 1976 (with an update in 1994). In 2009 the IAU adopted a new current set, and recognizing that new observations and techniques continuously provide better values for these constants, they decided to not fix these values, but have the Working Group on Numerical Standards continuously maintain a set of Current Best Estimates. The set of constants is widely reproduced in publications such as the Astronomical Almanac of the United States Naval Observatory and Her Majesty's Nautical Almanac Office.Besides the IAU list of units and constants, also the International Earth Rotation Service defines constants relevant to the orientation and rotation of the Earth, in its technical notes .The IAU system of constants defines a system of astronomical units for length, mass and time (in fact, several such systems), and also includes constants such as the speed of light and the constant of gravitation which allow transformations between astronomical units and SI units. Slightly different values for the constants are obtained depending on the frame of reference used. Values quoted in barycentric dynamical time (TDB) or equivalent time scales such as the Teph of the Jet Propulsion Laboratory ephemerides represent the mean values that would be measured by an observer on the Earth's surface (strictly, on the surface of the geoid) over a long period of time. The IAU also recommends values in SI units, which are the values which would be measured (in proper length and proper time) by an observer at the barycentre of the Solar System: these are obtained by the following transformations:".
- Astronomical_constant wikiPageExternalLink asa.usno.navy.mil.
- Astronomical_constant wikiPageExternalLink Astronomical_Constants_2009.pdf.
- Astronomical_constant wikiPageExternalLink www.astronomynotes.com.
- Astronomical_constant wikiPageExternalLink tablesa.htm.
- Astronomical_constant wikiPageExternalLink astro.html.
- Astronomical_constant wikiPageID "1883477".
- Astronomical_constant wikiPageRevisionID "555785935".
- Astronomical_constant date "February 2013".
- Astronomical_constant hasPhotoCollection Astronomical_constant.
- Astronomical_constant inaccurate "yes".
- Astronomical_constant subject Category:Astrophysics.
- Astronomical_constant subject Category:Physical_constants.
- Astronomical_constant subject Category:Units_of_measurement_in_astronomy.
- Astronomical_constant type Abstraction100002137.
- Astronomical_constant type Cognition100023271.
- Astronomical_constant type Concept105835747.
- Astronomical_constant type Constant105858936.
- Astronomical_constant type Content105809192.
- Astronomical_constant type DefiniteQuantity113576101.
- Astronomical_constant type Idea105833840.
- Astronomical_constant type Measure100033615.
- Astronomical_constant type PhysicalConstants.
- Astronomical_constant type PsychologicalFeature100023100.
- Astronomical_constant type Quantity105855125.
- Astronomical_constant type UnitOfMeasurement113583724.
- Astronomical_constant type UnitsOfMeasureInAstronomy.
- Astronomical_constant comment "An astronomical constant is a physical constant used in astronomy. Formal sets of constants, along with recommended values, have been defined by the International Astronomical Union (IAU) several times: in 1964 and in 1976 (with an update in 1994).".
- Astronomical_constant label "Astronomical constant".
- Astronomical_constant sameAs Αστρονομική_σταθερά.
- Astronomical_constant sameAs m.063jkl.
- Astronomical_constant sameAs Q3556678.
- Astronomical_constant sameAs Q3556678.
- Astronomical_constant sameAs Astronomical_constant.
- Astronomical_constant wasDerivedFrom Astronomical_constant?oldid=555785935.
- Astronomical_constant isPrimaryTopicOf Astronomical_constant.