/* C include file containing commonly used constants */

#define cvel 2.997925e8          /* Velocity of light */
#define pi 3.141592653589793     /* pi */
#define sidr 1.2153526418977e-6  /* Sidereal rate */
#define rtod 57.2957795130823    /* Scales radians to degrees */
#define mastor 4.84813681109536e-9 /* milliarcsec to radians */
#define rtomas 2.06264806247096e+8 /* radians to milliarcsec */
#define rtoas  2.06264806247096e+5 /* radians to arcsec */
#define rtoam  3.43774677078494e+3 /* radians to milliarcsec */
#define dtor 0.0174532925199433  /* Scales degrees to radians */
#define rtoh 3.81971863420549    /* Scales radians to hours */
#define daysec 86400.0           /* Seconds in a day */
#define twopi 6.28318530717959   /* 2*pi */
#define halfpi 1.5707963267949   /* pi/2 */
#define uttost 0.9972695657      /* Sidereal secs per UT second */
#define uttomin (1.0/60.0)       /* Minutes per internal time unit */