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Nine astronomical periods at a given age

Source: R/calculate_orbit9.R
calculate_orbit9.Rd

Nine principal orbital periods (calculate_orbit9.m in Acycle): La2004 secular frequencies g_i, s_i and the AstroGeo22 precession constant k(t) at the age rounded to the nearest Ma.

Usage

calculate_orbit9(age_ma, data_dir = NULL)

Arguments

age_ma

Age at which the nine periods are calculated, in Ma (single finite numeric value, 0 to 4429); it is rounded to the nearest whole Ma because AstroGeo22 is tabulated in 1-Myr steps. Required, no default.

data_dir

Folder that contains the astronomical data tables AstroGeo22.txt and La04gisi.csv (character path); NULL uses the tables installed with the package (or the folder set with options(cocoR.data = ...)). Default=NULL.

Value

data.frame with columns term, group, freq_arcsec_yr, period_yr, period_kyr.