!*    *PARAMETER* OF GLOBAL CONSTANTS.
!*     VARIABLE.   TYPE.     PURPOSE.
!      ---------   -------   --------
!      *G*         REAL      ACCELLERATION OF GRAVITY.
!      *PI*        REAL      PI.
!      *CIRC*      REAL      EARTH CIRCUMFERENCE (METRES).
!      *RAD*       REAL      PI / 180.
!      *DEG*       REAL      180. / PI.
!      *ZPI*       REAL      2. * PI.
!      *R*         REAL      EARTH RADIUS        (METRES).
REAL,PARAMETER :: G = 9.806, PI = 3.14159265358978, CIRC = 40000000.
REAL,PARAMETER :: ZPI = 2. * PI, RAD = PI / 180., DEG=180./PI, R=CIRC/ZPI
