| spdlunar {TideHarmonics} | R Documentation |
Speeds For Basic Astronomical Periods
Description
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.
Usage
spdlunar
spdsolar
Format
Numeric vectors of length six.