using JPLEphemeris.ASCII
# Download and convert ephemeris DE421
getephem(421)
# Load ephemeris DE421
eph = Ephemeris(421)
# 2014-01-01T00:00 in Julian days
jd = 2456658.5
# Position of Mercury w.r.t. the Solar System's barycentre at 2014-01-01T00:00
# [km]
pos = position(eph, "mercury", jd)
# Velocity of Mercury w.r.t. the Solar System's barycentre at 2014-01-01T00:00
# [km/day]
vel = velocity(eph, "mercury", jd)
# Complete state vector (position and velocity) for a range of Julian days
st = state(eph, "mercury", jd:jd+100)
# The ephemeris also contains the set of constants with which it was calculated
# e.g. the Astronomical Unit (AU)
au = eph.constants["AU"]
# Close ephemeris file
close(eph)- Mercury:
"mercury" - Venus:
"venus" - Earth-Moon system's barycenter:
"earthmoon" - Mars:
"mars" - Jupiter:
"jupiter" - Saturn:
"saturn" - Uranus:
"uranus" - Neptune:
"neptune" - Pluto:
"pluto" - Moon (geocentric):
"moon" - Sun:
"sun" - Librations:
"librations" - Nutations:
"nutations"