Calculates astronomical longitudes for given days.
Mainly for internal use.
Usage
lambdas(dvec, astlon = c("task","cartwright"), …)
Arguments
dvec
A vector of days. Should be a Date object or an
object that can be converted to a Date object.
astlon
The longitude formula to be used. The default
"task" is the formulas use in the TASK-2000 software. The
alternative "cartwright" uses Cartwright(1982).
…
Passed to the as.Date function.
Value
A numeric matrix. Values are in degrees and given in the
interval [0,360]. The rows represent astronomical periods
of increasing length: sidereal month (s), tropical year (h),
lunar perigee (p), lunar nodal (N), sun's perihelion (ph).
These correspond to the last five Doodson numbers.