/** @brief Get an estimation of when a planet is gone past a fixed point
**
** Get Julian day number and positions when a celestial object is gone past
** a fixed point expressed in longitude degrees. This is not meant to be
** precise at all. Mainly used in swephelp search routines.
**
** @attention Same warning as in swh_next_retro.
**
** @remarks If step is set to 0, use a predefined step (recommended).
**
** @param planet Planet number (SE_*, etc)
** @param fixedpt Fixed pointed targeted [0;360[
** @param jdstart Julian day number, when search is starting
** @param step Number of days used in the dichotomic search process
** @param backw Search before jdstart [1], or after [0] (boolean)
** @param flag Calculation flags, see swisseph docs
** @param jdret Julian day number found
** @param posret Planet's positions found
** @param err Buffer for errors, declared as char[256]
** @return 0 on success, -1 on error
*/
int swh_go_past(int planet, double fixedpt, double jdstart, double step,
int backw, int flag, double *jdret, double *posret, char *err)
{
int res;
double testjd, difdegn[2], difdeg2n[2];
/* find step if 0 */
if (step == 0)
{
step = swh_min_retro_time(planet, err);
if (step < 0) { step = 10; } /* never retro, use default step */
} else { step = fabs(step); }
/* get start position */
res = swe_calc_ut(jdstart, planet, flag, posret, err);
if (res < 0) { return -1; }
/* get difference between start pt and fixed pt */
difdegn[1] = swe_difdegn(posret[0], fixedpt);
difdeg2n[1] = swe_difdeg2n(posret[0], fixedpt);
*jdret = jdstart;
while (1)
{
*jdret = (backw) ? *jdret-step : *jdret+step;
res = swe_calc_ut(*jdret, planet, flag, posret, err);
if (res < 0) { return -1; }
if (posret[3] < 0)
{
res = swh_next_retro(planet, *jdret, step, (backw) ? 0 : 1,
0, flag, &testjd, posret, err);
if (res < 0) { return -1; }
}
else { testjd = *jdret; }
difdegn[0] = swe_difdegn(posret[0], fixedpt);
difdeg2n[0] = swe_difdeg2n(posret[0], fixedpt);
if (ISPOSITIVE(difdeg2n[1]) != ISPOSITIVE(difdeg2n[0])
&& fabs(difdegn[1]-difdegn[0]) > 180)
{
*jdret = testjd;
return 0;
}
difdegn[1] = difdegn[0];
difdeg2n[1] = difdeg2n[0];
}
}
/** @brief Find next aspect between two moving objects
**
** Same as swh_next_aspect_with, but aspect in [0;180], instead of [0;360[.
**
** @see swh_next_aspect_with()
**
** @remarks If aspect is not 0 or 180, it will try two aspects [0;360[, and
** return the nearest from jdstart. It may then be faster to use
** swh_next_aspect_with several times, especially when scanning
** long periods of time.
*/
int swh_next_aspect_with2(int planet, double aspect, int other, char *star,
double jdstart, double step, int backw, double dayspan, int flag,
double *jdret, double *posret0, double *posret1, char *err)
{
int res, res2;
double jdtmp, postmp0[6], postmp1[6];
aspect = fabs(swe_difdeg2n(0, aspect));
if (aspect == 0 || aspect == 180)
{
return swh_next_aspect_with(planet, aspect, other, star, jdstart, step,
backw, dayspan, flag, jdret, posret0, posret1, err);
}
/* else try both */
res = swh_next_aspect_with(planet, aspect, other, star, jdstart, step,
backw, dayspan, flag, jdret, posret0, posret1, err);
if (res < 0) { return -1; }
res2 = swh_next_aspect_with(planet, 0-aspect, other, star, jdstart, step,
backw, dayspan, flag, &jdtmp, postmp0, postmp1, err);
if (res2 < 0) { return -1; }
if (res == 1 && res2 == 1) { return 1; } /* both reached time limit */
else if (res != res2) /* one reached limit */
{
if (res2 == 0)
{
*jdret = jdtmp;
for (res = 0; res < 6; res++) { posret0[res] = postmp0[res]; }
for (res = 0; res < 6; res++) { posret1[res] = postmp1[res]; }
}
}
else /* both found something */
{
if (backw)
{
if (jdtmp > *jdret)
{
*jdret = jdtmp;
for (res = 0; res < 6; res++) { posret0[res] = postmp0[res]; }
for (res = 0; res < 6; res++) { posret1[res] = postmp1[res]; }
}
}
else
{
if (jdtmp < *jdret)
{
*jdret = jdtmp;
for (res = 0; res < 6; res++) { posret0[res] = postmp0[res]; }
for (res = 0; res < 6; res++) { posret1[res] = postmp1[res]; }
}
}
}
return 0;
}
/** @brief Find next aspect to a house cusp
**
** Same as swh_next_aspect_cusp, but aspect in [0;180], instead of [0;360[.
**
** @see swh_next_aspect_cusp()
**
** @remarks If aspect is not 0 or 180, it will try two aspects [0;360[, and
** return the nearest from jdstart. It may then be faster to use
** swh_next_aspect_cusp several times, especially when scanning
** long periods of time.
*/
int swh_next_aspect_cusp2(int planet, char *star, double aspect, int cusp,
double jdstart, double lat, double lon, int hsys, double step, int backw,
int flag, double *jdret, double *posret, double *cuspsret, double *ascmcret,
char *err)
{
int res, res2;
double jdtmp, postmp[6], cuspstmp[37], ascmctmp[10];
aspect = fabs(swe_difdeg2n(0, aspect));
if (aspect == 0 || aspect == 180)
{
return swh_next_aspect_cusp(planet, star, aspect, cusp, jdstart, lat,
lon, hsys, step, backw, flag, jdret, posret, cuspsret, ascmcret,
err);
}
/* else try both */
res = swh_next_aspect_cusp(planet, star, aspect, cusp, jdstart, lat,
lon, hsys, step, backw, flag, jdret, posret, cuspsret, ascmcret,
err);
if (res < 0) { return -1; }
res2 = swh_next_aspect_cusp(planet, star, aspect, cusp, jdstart, lat,
lon, hsys, step, backw, flag, &jdtmp, postmp, cuspstmp, ascmctmp,
err);
if (res2 < 0) { return -1; }
if (backw)
{
if (jdtmp > *jdret)
{
*jdret = jdtmp;
for (res = 0; res < 6; res++) { posret[res] = postmp[res]; }
for (res = 0; res < 37; res++) { cuspsret[res] = cuspstmp[res]; }
for (res = 0; res < 10; res++) { ascmcret[res] = ascmctmp[res]; }
}
}
else
{
if (jdtmp < *jdret)
{
*jdret = jdtmp;
for (res = 0; res < 6; res++) { posret[res] = postmp[res]; }
for (res = 0; res < 37; res++) { cuspsret[res] = cuspstmp[res]; }
for (res = 0; res < 10; res++) { ascmcret[res] = ascmctmp[res]; }
}
}
return 0;
}
/** @brief Aspect matching
**
** Same as swh_match_aspect, but aspect in [0;180], instead of [0;360[
**
** @see swh_match_aspect()
*/
int swh_match_aspect2(double pos0, double speed0, double pos1, double speed1,
double aspect, double orb, double *diffret, int *applic, double *factor)
{
double difdeg2n = swe_difdeg2n(pos0, pos1);
double diff = fabs(difdeg2n);
aspect = fabs(aspect);
orb = fabs(orb);
if (difdeg2n > 0)
{
if (diff > aspect)
{
if (speed1 > speed0) { *applic = -1; }
else if (speed1 < speed0) { *applic = 1; }
else { *applic = 0; }
*diffret = diff-aspect;
}
else if (diff < aspect)
{
if (speed1 > speed0) { *applic = 1; }
else if (speed1 < speed0) { *applic = -1; }
else { *applic = 0; }
*diffret = aspect-diff;
}
else /* aspect exact */
{
if (speed1 != speed0) { *applic = 1; }
else { *applic = 0; }
*diffret = 0;
*factor = 0;
return 0;
}
}
else if (difdeg2n > -180)
{
if (diff > aspect)
{
if (speed1 > speed0) { *applic = 1; }
else if (speed1 < speed0) { *applic = -1; }
else { *applic = 0; }
*diffret = diff-aspect;
}
else if (diff < aspect)
{
if (speed1 > speed0) { *applic = -1; }
else if (speed1 < speed0) { *applic = 1; }
else { *applic = 0; }
*diffret = aspect-diff;
}
else /* aspect exact */
{
if (speed1 != speed0) { *applic = 1; }
else { *applic = 0; }
*diffret = 0;
*factor = 0;
return 0;
}
}
else /* exact conjunction or opposition */
{
if (speed1 != speed0) { *applic = 1; }
else { *applic = 0; }
*diffret = 0;
*factor = 0;
return 0;
}
*factor = *diffret / orb;
if (aspect-orb <= diff && diff <= aspect+orb) { return 0; } /* match */
else { return -1; } /* no match */
}
/** @brief Find next aspect to a house cusp
**
** Get Julian day number and positions, and houses cusps, when a
** celestial object makes longitudinal aspect to a house cusp.
**
** @attention Here, step may not be too high, or 0. Setting it to 0.2 is enough.
**
** @remarks If star != "", the planet is ignored.
**
** @see For risings, settings, meridian transits, see swe_rise_trans.
**
** @param planet Planet number (SE_*, etc)
** @param star Fixed star
** @param aspect Aspect, in degrees [0;360[
** @param cusp House cusp number [1;12], or [1;36] for Gauquelin sectors
** @param jdstart Julian day number, when search is starting
** @param lat Latitude, in degrees (north is positive)
** @param lon Longitude, in degrees (east is positive)
** @param hsys House system, see swisseph docs
** @param step Number of days used in the dichotomic search process
** @param backw Search before jdstart [1], or after [0] (boolean)
** @param flag Calculation flags, see swisseph docs
** @param jdret Julian day number found
** @param posret Planet (or fixed star) positions found
** @param cuspsret House cusps positions found
** @param ascmcret Asc-Mc-etc found, see swisseph docs
** @param err Buffer for errors, declared as char[256]
** @return 0 on success, -1 on error
*/
int swh_next_aspect_cusp(int planet, char *star, double aspect, int cusp,
double jdstart, double lat, double lon, int hsys, double step, int backw,
int flag, double *jdret, double *posret, double *cuspsret, double *ascmcret,
char *err)
{
int res, starflag;
double diff[4];
char starbuf[41];
aspect = swe_degnorm(aspect);
step = fabs(step);
if (step == 0) { step = 0.2; }
/* get start position */
if (strcmp("", star) != 0)
{
strcpy(starbuf, star); /* only first time */
res = swe_fixstar_ut(starbuf, jdstart, flag, posret, err);
if (res < 0) { return -1; }
starflag = 1;
}
else
{
res = swe_calc_ut(jdstart, planet, flag, posret, err);
if (res < 0) { return -1; }
starflag = 0;
}
res = swe_houses_ex(jdstart, flag, lat, lon, hsys, cuspsret, ascmcret);
if (res < 0) { return -1; }
/* compare */
diff[1] = swe_difdeg2n(posret[0], cuspsret[cusp] + aspect);
diff[3] = swe_difdegn(posret[0], cuspsret[cusp] + aspect);
*jdret = jdstart;
while (step > swh_precision)
{
*jdret = (backw) ? *jdret-step : *jdret+step;
/* get positions */
if (starflag)
{
res = swe_fixstar_ut(starbuf, *jdret, flag, posret, err);
if (res < 0) { return -1; }
}
else
{
res = swe_calc_ut(*jdret, planet, flag, posret, err);
if (res < 0) { return -1; }
}
res = swe_houses_ex(*jdret, flag, lat, lon, hsys, cuspsret, ascmcret);
if (res < 0) { return -1; }
/* compare */
diff[0] = swe_difdeg2n(posret[0], cuspsret[cusp] + aspect);
diff[2] = swe_difdegn(posret[0], cuspsret[cusp] + aspect);
if (ISPOSITIVE(diff[1]) != ISPOSITIVE(diff[0])
&& fabs(diff[3]-diff[2]) > 180)
{
backw = (backw) ? 0 : 1;
step = step/2;
}
diff[1] = diff[0];
diff[3] = diff[2];
}
return 0;
}
/** @brief Find next aspect between two moving objects
**
** Get Julian day number and positions when a celestial object makes a
** longitudinal aspect to another moving object.
**
** @attention Here, step may not be set to 0. If you estimate that the aspect
** is to occur in a very long time, you better set it to a high value, for
** faster results. In doubt, set it to 10.
**
** @remarks If star != "", the other planet is ignored.
** If dayspan is set to 0, the search is not limited in time.
** Otherwise, the function may return 1 when time limit has been reached.
**
** @param planet Planet number (SE_*, etc)
** @param aspect Aspect, in degrees [0;360[
** @param other Other planet number
** @param star Fixed star
** @param jdstart Julian day number, when search is starting
** @param step Number of days used in the dichotomic search process
** @param backw Search before jdstart [1], or after [0] (boolean)
** @param dayspan Limit search to a certain time, expressed in days
** @param flag Calculation flags, see swisseph docs
** @param jdret Julian day number found
** @param posret0 Planet's positions found
** @param posret1 Other planet (or star) positions found
** @param err Buffer for errors, declared as char[256]
** @return 0 on success, 1 if time limit reached, -1 on error
*/
int swh_next_aspect_with(int planet, double aspect, int other, char *star,
double jdstart, double step, int backw, double dayspan, int flag,
double *jdret, double *posret0, double *posret1, char *err)
{
int res, starflag, direct = 0; /* dummy assign */
double jdstop = 0, diff[4]; /* dummy assign */
char starbuf[41];
aspect = swe_degnorm(aspect);
step = fabs(step);
if (step == 0) { step = 10; }
dayspan = fabs(dayspan);
if (dayspan)
{
jdstop = (backw) ? jdstart-dayspan : jdstart+dayspan;
direct = (backw) ? 0 : 1;
}
/* get planets positions */
res = swe_calc_ut(jdstart, planet, flag, posret0, err);
if (res < 0) { return -1; }
if (strcmp("", star) != 0)
{
strcpy(starbuf, star); /* only first time */
res = swe_fixstar_ut(starbuf, jdstart, flag, posret1, err);
if (res < 0) { return -1; }
starflag = 1;
}
else
{
res = swe_calc_ut(jdstart, other, flag, posret1, err);
if (res < 0) { return -1; }
starflag = 0;
}
/* compare */
diff[1] = swe_difdeg2n(posret0[0], posret1[0] + aspect);
diff[3] = swe_difdegn(posret0[0], posret1[0] + aspect);
*jdret = jdstart;
while (step > swh_precision)
{
*jdret = (backw) ? *jdret-step : *jdret+step;
/* get planets positions */
res = swe_calc_ut(*jdret, planet, flag, posret0, err);
if (res < 0) { return -1; }
if (starflag)
{
res = swe_fixstar_ut(starbuf, *jdret, flag, posret1, err);
if (res < 0) { return -1; }
}
else
{
res = swe_calc_ut(*jdret, other, flag, posret1, err);
if (res < 0) { return -1; }
}
/* compare */
diff[0] = swe_difdeg2n(posret0[0], posret1[0] + aspect);
diff[2] = swe_difdegn(posret0[0], posret1[0] + aspect);
if (ISPOSITIVE(diff[1]) != ISPOSITIVE(diff[0])
&& fabs(diff[3]-diff[2]) > 180) /* invert step */
{
if (dayspan && backw == direct)
{
if (direct) { if (*jdret > jdstop) return 1; }
else { if (*jdret < jdstop) return 1; }
}
backw = (backw) ? 0 : 1;
step = step/2;
}
else if (dayspan && backw != direct)
{
if (direct) { if (*jdret > jdstop) return 1; }
else { if (*jdret < jdstop) return 1; }
}
diff[1] = diff[0];
diff[3] = diff[2];
}
return 0;
}
int swh_saturn_4_stars( const double jd, const int flag, double* ret, char* err )
{
char starbuf[50];
double xx[6];
double* stars[2] = {0,0}; /* dummy assign */
double midp, dist0, dist1, dist2;
int i;
/* Get bodies positions */
i = swe_calc_ut( jd, SE_SATURN, flag, xx, err );
if ( i < 0 )
return -1;
ret[0] = xx[0];
strcpy( starbuf, "Aldebaran" );
i = swe_fixstar_ut( starbuf, jd, flag, xx, err );
if ( i < 0 )
return -1;
ret[1] = xx[0];
strcpy( starbuf, "Regulus" );
i = swe_fixstar_ut( starbuf, jd, flag, xx, err );
if ( i < 0 )
return -1;
ret[2] = xx[0];
strcpy( starbuf, "Antares" );
i = swe_fixstar_ut( starbuf, jd, flag, xx, err );
if ( i < 0 )
return -1;
ret[3] = xx[0];
strcpy( starbuf, "Fomalhaut" );
i = swe_fixstar_ut( starbuf, jd, flag, xx, err );
if ( i < 0 )
return -1;
ret[4] = xx[0];
/* Find nearest stars from Saturn */
if ( ret[0] <= ret[1] || ret[0] > ret[4] )
{
stars[0] = &ret[4];
stars[1] = &ret[1];
}
else if ( ret[0] <= ret[2] )
{
stars[0] = &ret[1];
stars[1] = &ret[2];
}
else if ( ret[0] <= ret[3] )
{
stars[0] = &ret[2];
stars[1] = &ret[3];
}
else if ( ret[0] <= ret[4] )
{
stars[0] = &ret[3];
stars[1] = &ret[4];
}
/* Find midpoint between stars */
midp = swe_deg_midp( *stars[0], *stars[1] );
/* Find distance Saturn/midpoint */
dist0 = fabs( swe_difdeg2n( ret[0], midp ) );
/* Find which star is closer from saturn and calculate the index */
dist1 = fabs( swe_difdeg2n( ret[0], *stars[0] ) );
dist2 = fabs( swe_difdeg2n( ret[0], *stars[1] ) );
if ( dist1 <= dist2 ) /* first is closer */
ret[5] = dist0 / ( fabs( swe_difdeg2n( midp, *stars[0] ) ) / 100.0 );
else /* second is closer */
ret[5] = dist0 / ( fabs( swe_difdeg2n( midp, *stars[1] ) ) / 100.0 );
return 0;
}