Follow-up Comment #2, bug #37408 (group gsl):

The parsec could indeed be defined as:
#define GSL_CONST_MKSA_PARSEC (648000*GSL_CONST_MKSA_ASTRONOMICAL_UNIT/M_PI)
/* m */

Also, from the const/TODO, rather than giving a numerical value for the
radiation constant, it could be defined as:
#define GSL_CONST_MKSA_RADIATION_DENSITY_CONSTANT
(4*GSL_CONST_MKSA_STEFAN_BOLTZMANN_CONSTANT/GSL_CONST_MKSA_SPEED_OF_LIGHT) /*
J m-3 K-4 */



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