lib_vsop87_saturn

Library "lib_vsop87_saturn"

get_helio_lon(t)
  Computes Saturn's heliocentric ecliptic longitude using VSOP87 theory.
  Parameters:
    t (float): (float) Julian millennia from J2000.0 (use core.get_julian_millennia(time)).
  Returns: (float) Heliocentric ecliptic longitude in degrees, normalized to range [0, 360).

get_helio_lat(t)
  Computes Saturn's heliocentric ecliptic latitude using VSOP87 theory.
  Parameters:
    t (float): (float) Julian millennia from J2000.0 (use core.get_julian_millennia(time)).
  Returns: (float) Heliocentric ecliptic latitude in radians, range approximately [-0.05, +0.05]. Note: Returns radians, not degrees.

get_helio_radius(t)
  Computes Saturn's heliocentric radius (distance from Sun) using VSOP87 theory.
  Parameters:
    t (float): (float) Julian millennia from J2000.0 (use core.get_julian_millennia(time)).
  Returns: (float) Heliocentric radius in astronomical units (AU). Typical range is 9.02-10.05 AU.

get_geo_speed(t)
  Computes Saturn's geocentric longitude speed (rate of change over time).
  Parameters:
    t (float): (float) Julian millennia from J2000.0 (use core.get_julian_millennia(time)).
  Returns: (float) Geocentric longitude speed in degrees per day. Negative values indicate retrograde motion (apparent backward movement).

get_geo_lon(t)
  Computes Saturn's geocentric ecliptic longitude (as seen from Earth).
  Parameters:
    t (float): (float) Julian millennia from J2000.0 (use core.get_julian_millennia(time)).
  Returns: (float) Geocentric ecliptic longitude in degrees, normalized to range [0, 360).

get_geo_ecl_lat(t)
  Computes Saturn's geocentric ecliptic latitude (as seen from Earth).
  Parameters:
    t (float): (float) Julian millennia from J2000.0 (use core.get_julian_millennia(time)).
  Returns: (float) Geocentric ecliptic latitude in degrees, range approximately [-3, +3].

get_geo_decl(t)
  Computes Saturn's geocentric equatorial declination (as seen from Earth).
  Parameters:
    t (float): (float) Julian millennia from J2000.0 (use core.get_julian_millennia(time)).
  Returns: (float) Geocentric equatorial declination in degrees, range [-90, +90] where positive is north.