Robert Makemson Guide to Astronomy in Jacksonville

Solar Ecliptic (SE) and Heliographic (HG)

	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.

	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. DESCRIPTION OF COORDINATE SYSTEMS Please Click and Fill the Form below, then Submit Query to request parameters Select an activity List data Create file Planet name: VENUS MARS JUPITER SATURN URANUS NEPTUNE EARTH MERCURY Output coordinate system: Solar Ecliptic Heliographic Solar Ecliptic & Heliographic      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 http://ssd.jpl.nasa.gov/horizons.cgi