Robert Makemson Guide to Astronomy in Jacksonville

Solar Ecliptic (SE) and Heliographic (HG)

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The planets of our solar system revolve around the sun, tracing imaginary lines are called orbits. These orbits are not perfectly round but are ellipses. Geometrically, the sun is not at the “center” of the system, but one of the foci of the ellipse. The elliptical plane that contains these orbits is the ecliptic plane.

Heliospheric Planet Coordinates

Heliocentric Trajectories for Selected Planets
Coordinates are available in Solar Ecliptic (SE) and Heliographic (HG) (rotating and inertial) systems for 8 Planets, analytically propagated from December 25, 1988. They can be obtained at desired time period, and time resolution.


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Planet name:

Output coordinate system:      Time resolution (in days):

Start year (1959 - 2019): Start day: (1 - 366)
Stop year (1959 - 2019): Stop day: (1 - 366)

For more precise ecliptic coordinates see