Precision

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{{ActualVersion|0.12.4}}
 
Stellarium uses the [http://vizier.cfa.harvard.edu/viz-bin/ftp-index?/ftp/cats/VI/81 VSOP87] method to calculate the variation in position of the planets over time.  
 
Stellarium uses the [http://vizier.cfa.harvard.edu/viz-bin/ftp-index?/ftp/cats/VI/81 VSOP87] method to calculate the variation in position of the planets over time.  
  
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As far as Stellarium is concerned, the user should bear in mind the following properties of the VSOP87 method. Precision values here are positional as observed from Earth.
 
As far as Stellarium is concerned, the user should bear in mind the following properties of the VSOP87 method. Precision values here are positional as observed from Earth.
  
{|
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{| class="guidetable"
 
  |Object(s)
 
  |Object(s)
 
  |Method
 
  |Method
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  |Mercury, Venus, Earth-Moon barycenter, Mars
 
  |Mercury, Venus, Earth-Moon barycenter, Mars
 
  |VSOP87
 
  |VSOP87
  |Precision is 1 arc-second from 2000 B.C. - 6000 A.D.
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  |Precision is 1 arc-second from 2000 B.C. 6000 A.D.
 
  |-
 
  |-
 
  |Jupiter, Saturn
 
  |Jupiter, Saturn
 
  |VSOP87
 
  |VSOP87
  |Precision is 1 arc-second from 0 A.D. - 4000 A.D.
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  |Precision is 1 arc-second from 0 A.D. 4000 A.D.
 
  |-
 
  |-
 
  |Uranus, Neptune
 
  |Uranus, Neptune
 
  |VSOP87
 
  |VSOP87
  |Precision is 1 arc-second from 4000 B.C - 8000 A.D.
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  |Precision is 1 arc-second from 4000 B.C 8000 A.D.
 
  |-
 
  |-
 
  |Pluto
 
  |Pluto
 
  |?
 
  |?
  |Pluto's position is valid from 1885 A.D. -2099 A.D.
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  |Pluto's position is valid from 1885 A.D. 2099 A.D.
 
  |-
 
  |-
 
  |Earth's Moon
 
  |Earth's Moon
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  |Galilean satellites
 
  |Galilean satellites
 
  |L2
 
  |L2
  |Valid from 500 A.D - 3500 A.D.
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  |Valid from 500 A.D 3500 A.D.
 
  |}
 
  |}
  
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[[Category:Stellarium User Guide]]
 
[[Category:Stellarium User Guide]]

Revision as of 16:51, 4 October 2013

Information is actual for version 0.12.4

Stellarium uses the VSOP87 method to calculate the variation in position of the planets over time.

As with other methods, the precision of the calculations vary according to the planet and the time for which one makes the calculation. Reasons for these inaccuracies include the fact that the motion of the planet isn't as predictable as Newtonian mechanics would have us believe.

As far as Stellarium is concerned, the user should bear in mind the following properties of the VSOP87 method. Precision values here are positional as observed from Earth.

Object(s) Method Notes
Mercury, Venus, Earth-Moon barycenter, Mars VSOP87 Precision is 1 arc-second from 2000 B.C. – 6000 A.D.
Jupiter, Saturn VSOP87 Precision is 1 arc-second from 0 A.D. – 4000 A.D.
Uranus, Neptune VSOP87 Precision is 1 arc-second from 4000 B.C – 8000 A.D.
Pluto ? Pluto's position is valid from 1885 A.D. – 2099 A.D.
Earth's Moon ELP2000-82B Unsure about interval of validity or precision at time of writing. Possibly valid from 1828 A.D. to 2047 A.D.
Galilean satellites L2 Valid from 500 A.D – 3500 A.D.
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