This is circum.h in view mode; [Download] [Up]
#define SPD (24.0*3600.0) /* seconds per day */
#define EOD (-9786) /* special epoch flag: use epoch of date */
#define RTC (-1324) /* special tminc flag: use rt clock */
#define NOMJD (-58631.) /* an unlikely mjd for initing static mjd's */
#define NOHELIO (-2314) /* special s_hlong flag: means it and s_hlat are
* undefined
*/
#define STDHZN 0 /* rise/set times based on nominal conditions */
#define ADPHZN 1 /* rise/set times based on exact current " */
#define TWILIGHT 2 /* rise/set times for sun 18 degs below hor */
/* info about our local observing circumstances */
typedef struct {
double n_mjd; /* modified Julian date, ie, days since
* Jan 0.5 1900 (== 12 noon, Dec 30, 1899), utc.
* enough precision to get well better than 1 second.
* N.B. if not first member, must move NOMJD inits.
*/
double n_lat; /* latitude, >0 north, rads */
double n_lng; /* longitude, >0 east, rads */
double n_tz; /* time zone, hrs behind UTC */
double n_temp; /* atmospheric temp, degrees C */
double n_pressure; /* atmospheric pressure, mBar */
double n_height; /* height above sea level, earth radii */
double n_epoch; /* desired precession display epoch as an mjd, or EOD */
char n_tznm[4]; /* time zone name; 3 chars or less, always 0 at end */
} Now;
extern double mjd_day(), mjd_hr();
/* info about where and how we see something in the sky */
typedef struct {
double s_ra; /* ra, rads (precessed to n_epoch) */
double s_dec; /* dec, rads (precessed to n_epoch) */
double s_az; /* azimuth, >0 e of n, rads */
double s_alt; /* altitude above topocentric horizon, rads */
double s_sdist; /* dist from object to sun, au */
double s_edist; /* dist from object to earth, au */
double s_elong; /* angular sep between object and sun, >0 if east */
double s_hlong; /* heliocentric longitude, rads */
double s_hlat; /* heliocentric latitude, rads */
double s_size; /* angular size, arc secs */
double s_phase; /* phase, % */
double s_mag; /* visual magnitude */
} Sky;
/* flags for riset_cir() status */
#define RS_NORISE 0x001 /* object does not rise as such today */
#define RS_2RISES 0x002 /* object rises more than once today */
#define RS_NOSET 0x004 /* object does not set as such today */
#define RS_2SETS 0x008 /* object sets more than once today */
#define RS_CIRCUMPOLAR 0x010 /* object stays up all day today */
#define RS_2TRANS 0x020 /* transits twice in one day */
#define RS_NEVERUP 0x040 /* object never rises today */
#define RS_NOTRANS 0x080 /* doesn't transit today */
#define RS_ERROR 0x100 /* can't figure out times... */
/* shorthands for fields a Now pointer, np */
#define mjd np->n_mjd
#define lat np->n_lat
#define lng np->n_lng
#define tz np->n_tz
#define temp np->n_temp
#define pressure np->n_pressure
#define height np->n_height
#define epoch np->n_epoch
#define tznm np->n_tznm
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.