2.3.1 spase://CNES/NumericalData/CDPP-AMDA/Ephemerides/venus-orb-all Venus 2015-10-14T11:46:29Z Heliocentric Inertial (HCI) Frame : * The solar rotation axis is the primary vector: the Z axis points in the solar north direction; * The solar ascending node on the ecliptic of J2000 forms the X axis. * The Y axis is Z cross X, completing the right-handed reference frame. Heliocentric Earth Ecliptic (HEE) Frame : * The position of the earth relative to the sun is the primary vector: the X axis points from the sun to the earth. * The northern surface normal to the mean ecliptic of date is the secondary vector: the Z axis is the component of this vector orthogonal to the X axis. * The Y axis is Z cross X, completing the right-handed reference frame. Solar longitude (Ls) : * The solar longitude Ls is the Planet-Sun angle, measured from the Northern Hemisphere spring equinox where Ls=0. Ls=90 thus corresponds to northern summer solstice, just as Ls=180 marks the northern autumn equinox and Ls=270 the northern winter solstice. spase://CNES/Person/NAIF PrincipalInvestigator spase://SMWG/Repository/CNES/CDPP-AMDA Online Open http://amda.cdpp.eu Text.ASCII SPICE spase://CNES/Instrument/CDPP-AMDA/Ephemerides Ephemeris 1970-01-01T00:00:05Z 2035-01-19T22:00:04Z PT60M Venus xyz_hee xyz_venus_hee AU Cartesian HEE TimeSeries 3 x 1 xyz_venus_hee(0) y 2 xyz_venus_hee(1) z 3 xyz_venus_hee(2) Positional xyz_hci xyz_venus_hci AU Cartesian HCI TimeSeries 3 x 1 xyz_venus_hci(0) y 2 xyz_venus_hci(1) z 3 xyz_venus_hci(2) Positional distance venus-sun r_venus AU Positional latitude HCI venus_hci_lat deg longitude HCI venus_hci_lon deg latitude IAU_sun venus_sol_lat deg Positional longitude IAU_sun venus_sol_lon deg Positional solar longitude (Ls) venus_sol_ls deg Positional lon hae venus_lon_hae deg lat hae venus_lat_hae deg