Constants

The &constants namelist group defines various physical constants, as follows:

G_GRAVITY: Gravitational constant $G$
C_LIGHT: Speed of light in vacuo $c$
A_RADIATION: Radiation constant $a$
M_SUN: Solar mass $\Msun$
R_SUN: Solar radius $\Rsun$
L_SUN: Solar luminosity $\Lsun$
GYRE_DIR: Top-level GYRE directory; overrides the GYRE_DIR environment variable

All of these constants are in cgs units (where applicable), and the default values are defined in $GYRE_DIR/src/common/gyre_constants.fpp.