lib_elp2000_moon

2025年12月28日

Library "lib_elp2000_moon"

get_geo_ecl_lon(T)
  Parameters:
    T (float)

get_geo_ecl_lat(T)
  Parameters:
    T (float)

get_obliquity(T)
  Parameters:
    T (float)

get_declination(T)
  Parameters:
    T (float)

get_true_node_lon(T)
  Parameters:
    T (float)

get_true_south_node_lon(T)
  Parameters:
    T (float)

get_node_declination(T)
  Parameters:
    T (float)

get_south_node_declination(T)
  Parameters:
    T (float)

1月16日

リリースノート

v2
Exported the mean node functions that were previously internal. Node declination now uses the mean node instead of the true node, which is more consistent than the low-precision true-node perturbations. Functions renamed to "North/South" for astrological clarity.

Added:
get_mean_north_node_lon(T)
  Returns mean longitude of the Moon's North Node (ascending node).
  Parameters:
    T (float): (float) Julian centuries from J2000.0.
  Returns: (float) Longitude in degrees, range [0, 360).
note Mean node is a simple averaged calculation, reducing computational error. Used for declination calculations.

get_mean_south_node_lon(T)
  Returns mean longitude of the Moon's South Node (descending node).
  Parameters:
    T (float): (float) Julian centuries from J2000.0.
  Returns: (float) Longitude in degrees, range [0, 360). Equals North Node + 180°.

get_true_north_node_lon(T)
  Returns true longitude of the Moon's North Node with perturbation corrections.
  Parameters:
    T (float): (float) Julian centuries from J2000.0.
  Returns: (float) Longitude in degrees, range [0, 360).
note True node includes periodic perturbations but formula is low precision. Consider using mean node for consistency.

get_north_node_declination(T)
  Returns declination of the Moon's North Node.
  Parameters:
    T (float): (float) Julian centuries from J2000.0.
  Returns: (float) Declination in degrees, range [-23.4, +23.4] (bounded by obliquity).
note Uses mean node for calculation (more consistent than true node).

Updated:
get_geo_ecl_lon(T)
  Returns geocentric ecliptic longitude of the Moon.
  Parameters:
    T (float): (float) Julian centuries from J2000.0 (use core.get_julian_centuries).
  Returns: (float) Longitude in degrees, range [0, 360).

get_geo_ecl_lat(T)
  Returns geocentric ecliptic latitude of the Moon.
  Parameters:
    T (float): (float) Julian centuries from J2000.0.
  Returns: (float) Latitude in degrees.

get_obliquity(T)
  Returns mean obliquity of the ecliptic.
  Parameters:
    T (float): (float) Julian centuries from J2000.0.
  Returns: (float) Obliquity in degrees.

get_declination(T)
  Returns geocentric equatorial declination of the Moon.
  Parameters:
    T (float): (float) Julian centuries from J2000.0.
  Returns: (float) Declination in degrees, range [-90, +90] where positive is north.

get_true_south_node_lon(T)
  Returns true longitude of the Moon's South Node with perturbation corrections.
  Parameters:
    T (float): (float) Julian centuries from J2000.0.
  Returns: (float) Longitude in degrees, range [0, 360). Equals True North Node + 180°.

get_south_node_declination(T)
  Returns declination of the Moon's South Node.
  Parameters:
    T (float): (float) Julian centuries from J2000.0.
  Returns: (float) Declination in degrees. Inverse of North Node declination.

Removed:
get_true_node_lon(T)

get_node_declination(T)