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Full Earth-Moon state from a precession constant

Source: R/em_state.R
em_state.Rd

Full Earth-Moon state from a precession constant

Usage

em_state(k_kyr, obl_deg = AC$obl0_deg)

Arguments

k_kyr

Precession constant expressed as the period of the axial precession, in kyr (numeric, scalar or vector, > 0; about 25.7 today), i.e. a precession rate of 360 * 3600 / (k_kyr * 1000) arcsec/yr. The Earth-Moon distance giving this rate is searched between 20 Earth radii and the present distance (conserving the Earth-Moon angular momentum); values without a solution give NA. Required (no default).

obl_deg

Obliquity of the Earth used in the precession equation (Farhat et al. 2022, eq. A.7), in degrees (numeric). Default=AC$obl0_deg, i.e. the present-day obliquity, 23.2545 degrees.