2.3.1 spase://CNES/NumericalData/CDPP-AMDA/Ephemerides/earth-orb-all Earth 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. 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 2035-12-31T23:00:04Z PT60M Earth xyz_hci xyz_earth_hci AU Cartesian HCI TimeSeries 3 x 1 xyz_earth_hci(0) y 2 xyz_earth_hci(1) z 3 xyz_earth_hci(2) Positional distance earth-sun r_earth AU latitude HCI earth_hci_lat deg longitude HCI earth_hci_lon deg latitude IAU_sun earth_sol_lat deg longitude IAU_sun earth_sol_lon deg solar longitude (Ls) earth_sol_ls deg Positional