calcastrollongitudes.py

March 27, 2020 ยท View on GitHub

  • Computes the basic astronomical mean longitudes: s, h, p, N and PP
  • Note N is not N', i.e. N is decreasing with time.
  • Formulae for the period 1990-2010 were derived by David Cartwright

Calling Sequence

from pyTMD.calc_astrol_longitudes import calc_astrol_longitudes
s,h,p,N,PP = calc_astrol_longitudes(time, ASTRO5=True)

Inputs

  1. time: modified Julian day of input date

Options

  • MEEUS: use additional coefficients from Meeus Astronomical Algorithms
  • ASTRO5: use Meeus Astronomical coefficients as implemented in ASTRO5

Outputs

  • s: mean longitude of moon (degrees)
  • h: mean longitude of sun (degrees)
  • p: mean longitude of lunar perigee (degrees)
  • N: mean longitude of ascending lunar node (degrees)
  • PP: longitude of solar perigee (degrees)