Function calculate_precession_frequency 

pub fn calculate_precession_frequency(
    spin_rate_rad_s: f64,
    spin_inertia: f64,
    transverse_inertia: f64,
    stability_factor: f64,
) -> f64

Slow-mode (precession) angular frequency in rad/s — the slow coning of the spin axis: phi_slow = (Ix p / 2 Iy)(1 - sqrt(1 - 1/Sg)).