structs.h

typedef struct dust_record  *dust_pointer;
typedef struct planets_record  *planet_pointer;

typedef struct planets_record {
    double a;			/* semi-major axis of the orbit (in AU)*/
    double e;			/* eccentricity of the orbit	     */
    double mass;		/* mass (in solar masses)	     */
    int gas_giant;		/* TRUE if the planet is a gas giant */
    int orbit_zone;             /* the 'zone' of the planet          */
    double radius;		/* equatorial radius (in km)	     */
    double density;		/* density (in g/cc)		     */
    double orbital_period;   	/* length of the local year (days)   */
    double day;			/* length of the local day (hours)   */
    int resonant_period;	/* TRUE if in resonant rotation   */
    int axial_tilt;		/* units of degrees		     */
    double escape_velocity;	/* units of cm/sec		     */
    double surface_accel;  	/* units of cm/sec2		     */
    double surface_grav;   	/* units of Earth gravities	     */
    double rms_velocity;	/* units of cm/sec		     */
    double molecule_weight;	/* smallest molecular weight retained*/
    double volatile_gas_inventory;
    double surface_pressure;	/* units of millibars (mb)	     */
    int greenhouse_effect;	/* runaway greenhouse effect?	*/
    double boil_point;		/* the boiling point of water (Kelvin)*/
    double albedo;		/* albedo of the planet		     */
    double surf_temp;   	/* surface temperature in Kelvin     */
    double hydrosphere;		/* fraction of surface covered	     */
    double cloud_cover;		/* fraction of surface covered	     */
    double ice_cover;		/* fraction of surface covered	     */
#ifdef	MOON
    planet_pointer first_moon;
#endif	/* MOON */
    planet_pointer next_planet;
    } planets;


typedef struct dust_record {
	  double inner_edge;
	  double outer_edge;
	  int dust_present;
	  int gas_present;
	  dust_pointer next_band;
     } dust;