/**
  * Geometric constants used in navigation computations in
    classes within Rob's Moving Map package.

  * @author Robert J Morton
  * @version 15 January 1998 */

interface navconst {
  double 
    π = Math.PI,              // the circular constant
    Twoπ = π + π,             /* double circular constant (number 
                                 of radians in a complete turn) */
    πBy2 = π / 2,             // number of radians in a right-angle
    KPR = 6366.197723857773,  /* number of km equivalent to 
                                 a Great Circle (or earth-) radian */
    MPR = 6366197.723857773,  /* number of metres equivalent to 
                                 a Great Circle (or earth-) radian */
    DPR = 57.2957795141996,   // number of degrees per radian
    SPR = 648000 / π,         // number of seconds of arc per radian
    KphRps = KPR * 3600,      /* number of kilometres/hour equivalent
                                 to 1 earth-radian/second */
    TenDeg = 10 / DPR,        // 10 degrees in radians
    TkphRPS = 1000 / KphRps;  // divisor: 1000kph in radians per second
}