Here are the data structures with brief descriptions:
  arg | |
| earth_pert | |
| ln_date | Human readable Date and time used by libnova |
| ln_dms | Degrees, minutes and seconds |
| ln_ell_orbit | Elliptic Orbital elements |
| ln_equ_posn | Equatorial Coordinates |
| ln_gal_posn | Galactic coordinates |
| ln_helio_posn | Heliocentric position |
| ln_hms | Hours, minutes and seconds |
| ln_hrz_posn | Horizontal Coordinates |
| ln_hyp_orbit | Hyperbolic Orbital elements |
| ln_lnlat_posn | Ecliptical (or celestial) Longitude and Latitude |
| ln_nutation | Nutation in longitude, ecliptic and obliquity |
| ln_par_orbit | Parabolic Orbital elements |
| ln_rect_posn | Rectangular coordinates |
| ln_rst_time | Rise, Set and Transit times |
| ln_vsop | |
| ln_zonedate | Human readable Date and time with timezone information used by libnova |
| lnh_equ_posn | Right Ascension and Declination |
| lnh_hrz_posn | Azimuth and Altitude |
| lnh_lnlat_posn | Ecliptical (or celestial) Latitude and Longitude |
| main_problem | |
| nutation_arguments | |
| nutation_coefficients | |
| planet_pert | |
| pluto_argument | |
| pluto_latitude | |
| pluto_longitude | |
| pluto_radius | |
| XYZ | |
 year_TD |
