Type Alias: BodySource

type BodySource = 
  | "vsop87d"
  | "moon_chebyshev"
  | "meeus_ch47"
  | "chebyshev_pack"
  | "meeus_ch37"
  | "kepler_pack"
  | "analytic"
  | "synthetic";

The position source active for a body in a given engine's data.