Precession constant implied by one measured cycle period

Precession constant implied by one measured cycle period

Usage

k_from_period(period_kyr, term = "k+s3", gs = LA2004)

Arguments

period_kyr

Measured period of the cycle in kyr (numeric, > 0; a vector gives one value per period). Required (no default).

term

Astronomical term the cycle is read as (character), one of "k+s3" (obliquity), "k+g5", "k+g2", "k+g4" or "k+g3" (precession); its secular frequency is subtracted from the observed frequency to give the precession constant. Default="k+s3".

gs

Secular frequencies in arcsec/yr: a list with elements g and s, each a numeric vector of the nine fundamental frequencies g1-g9 and s1-s9. The default LA2004 is the La2004 table (Laskar et al., 2004) defined inside the function. Default=LA2004.