"""Own unit definitions; no observed data/constants are silently fitted."""
NOMINAL_SOLAR_MASS_PARAMETER=1.3271244e20  # m^3 s^-2, nominal GM_sun
KPC_METRES=3.0856775814913673e19
GRAVITY_KPC_KMS2_PER_SOLAR_MASS=NOMINAL_SOLAR_MASS_PARAMETER/KPC_METRES/1e6