spdlunar: Speeds For Basic Astronomical Periods
In TideHarmonics: Harmonic Analysis of Tides

Description Usage Format See Also

The spdlunar vector contains speeds (angular frequencies) in degrees per msh (mean solar hour) for the astronomic periods corresponding to the six digits of the (lunar) Doodson number. The periods are given by (i) the mean lunar day (ii) the sidereal month (iii) the tropical year (iv) the perigeal cycle of the moon (v) the nodal cycle of the moon (vi) the perihelion cycle of the sun.

The spdsolar vector contains speeds (angular frequencies) in degrees per msh (mean solar hour) for the astronomic periods corresponding to the six digits of the solar Doodson number. It is the same as spdlunar except that the first value corresponds to the mean solar day instead of the mean lunar day.

To obtain the astronomic periods in msh, take the inverse of the vector and multiply by 360.