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Astronomy

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    $\begingroup$ The motion of the Moon's north node is rather irregular. Using my plotting script I get this graph. $\endgroup$
    – PM 2Ring
    Commented Mar 29 at 1:12
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    $\begingroup$ Horizons says OM is 15.125° on 2024-Apr-27 23:40 TDB, but that's for the J2000 equinox. If you want to use the "of date" equinox you need to adjust for precession of the equinox, as Mike G mentioned on one of your earlier questions. $\endgroup$
    – PM 2Ring
    Commented Mar 29 at 1:13
  • $\begingroup$ Your Python code appears to be checking the Moon's longitude, not its north node's longitude. $\endgroup$
    – PM 2Ring
    Commented Mar 29 at 1:25
  • $\begingroup$ Adjusting for precession 0.3402638°, so OM=14.784736°, gives 2024-May-11 01:00:36 TDB ssd.jpl.nasa.gov/api/… $\endgroup$
    – PM 2Ring
    Commented Mar 29 at 2:26
  • $\begingroup$ PM 2Ring, I appreciate your comments select_date = swe.julday(2024, 5, 10, 21.55067, swe.GREG_CAL) this is what the swieesph code prints alculation successful! Ascending node: Position: (15.125165845230343,) Descending node: Position: (195.12516584523127,) Velocity: (0.0, 0.0, 0.0) Perihelion: Position: (4.957640578587505,) Velocity: (-0.9184831739624794, 0.002406733121510601, 0.0, 0.0, 0.0) Aphelion: Position: (184.9576405785884,) Velocity: (0.9184831739628908, 0.0027318105529593037, 0.0, 0.0, 0.0) $\endgroup$
    – dimitri33
    Commented Mar 29 at 4:56