#include "more_math.h" /* The #include above isn't necessary here since we don't use the functions * in this file outside of their definitions, but it doesn't hurt and you'd * usually #include the corresponding .h file in a .c file just in case the * functions in the .c file call each other. */ double colatitude(double lat) { return 90 - lat; } double to_radians(double a) { return (3.1415926535897932384 / 180.0) * a; }