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include <math.h>
include "skywcsdef.h"
include "skywcs.h"
# SK_ULTRAN -- Transform the sky coordinates from the input coordinate
# system to the output coordinate system using the units conversions as
# appropriate.
procedure sk_ultran (cooin, cooout, ilng, ilat, olng, olat, npts)
pointer cooin #I pointer to the input coordinate system structure
pointer cooout #I pointer to the output coordinate system structure
double ilng[ARB] #I the input ra/longitude in radians
double ilat[ARB] #I the input dec/latitude in radians
double olng[ARB] #O the output ra/longitude in radians
double olat[ARB] #O the output dec/latitude in radians
int npts #I the number of points to be converted
double tilng, tilat, tolng, tolat
int i
begin
do i = 1, npts {
switch (SKY_NLNGUNITS(cooin)) {
case SKY_HOURS:
tilng = DEGTORAD(15.0d0 * ilng[i])
case SKY_DEGREES:
tilng = DEGTORAD(ilng[i])
case SKY_RADIANS:
tilng = ilng[i]
default:
tilng = ilng[i]
}
switch (SKY_NLATUNITS(cooin)) {
case SKY_HOURS:
tilat = DEGTORAD(15.0d0 * ilat[i])
case SKY_DEGREES:
tilat = DEGTORAD(ilat[i])
case SKY_RADIANS:
tilat = ilat[i]
default:
tilat = ilat[i]
}
call sk_lltran (cooin, cooout, tilng, tilat, INDEFD, INDEFD,
0.0d0, 0.0d0, tolng, tolat)
switch (SKY_NLNGUNITS(cooout)) {
case SKY_HOURS:
olng[i] = RADTODEG(tolng) / 15.0d0
case SKY_DEGREES:
olng[i] = RADTODEG(tolng)
case SKY_RADIANS:
olng[i] = tolng
default:
olng[i] = tolng
}
switch (SKY_NLATUNITS(cooout)) {
case SKY_HOURS:
olat[i] = RADTODEG(tolat) / 15.0d0
case SKY_DEGREES:
olat[i] = RADTODEG(tolat)
case SKY_RADIANS:
olat[i] = tolat
default:
olat[i] = tolat
}
}
end
# SK_LLTRAN -- Transform the sky coordinate from the input coordinate
# system to the output coordinate system assuming that all the coordinate
# are in radians.
procedure sk_lltran (cooin, cooout, ilng, ilat, ipmlng, ipmlat, px, rv,
olng, olat)
pointer cooin #I pointer to the input coordinate system structure
pointer cooout #I pointer to the output coordinate system structure
double ilng #I the input ra/longitude in radians
double ilat #I the input dec/latitude in radians
double ipmlng #I the input proper motion in ra in radians
double ipmlat #I the input proper motion in dec in radians
double px #I the input parallax in arcseconds
double rv #I the input radial velocity in km / second
double olng #O the output ra/longitude in radians
double olat #O the output dec/latitude in radians
int pmflag
double pmr, pmd
double sl_epj(), sl_epb()
begin
# Test for the case where the input coordinate system is the
# same as the output coordinate system.
if (SKY_CTYPE(cooin) == SKY_CTYPE(cooout)) {
switch (SKY_CTYPE(cooin)) {
case CTYPE_EQUATORIAL:
call sk_equatorial (cooin, cooout, ilng, ilat, ipmlng,
ipmlat, px, rv, olng, olat)
case CTYPE_ECLIPTIC:
if (SKY_EPOCH(cooin) == SKY_EPOCH(cooout)) {
olng = ilng
olat = ilat
} else {
call sl_eceq (ilng, ilat, SKY_EPOCH(cooin), olng, olat)
call sl_eqec (olng, olat, SKY_EPOCH(cooout), olng, olat)
}
default:
olng = ilng
olat = ilat
}
return
}
# Compute proper motions ?
if (! IS_INDEFD(ipmlng) && ! IS_INDEFD(ipmlat))
pmflag = YES
else
pmflag = NO
# Cover the remaining cases.
switch (SKY_CTYPE(cooin)) {
# The input system is equatorial.
case CTYPE_EQUATORIAL:
switch (SKY_RADECSYS(cooin)) {
case EQTYPE_FK4, EQTYPE_FK4NOE:
if (pmflag == YES) {
call sl_pm (ilng, ilat, ipmlng, ipmlat, px, rv,
sl_epb (SKY_EPOCH(cooin)), sl_epb (SKY_EPOCH(cooout)),
olng, olat)
} else {
olng = ilng
olat = ilat
}
if (SKY_RADECSYS(cooin) == EQTYPE_FK4)
call sl_suet (olng, olat, SKY_EQUINOX(cooin), olng, olat)
if (SKY_EQUINOX(cooin) != 1950.0d0)
call sl_prcs (1, SKY_EQUINOX(cooin), 1950.0d0, olng, olat)
call sl_adet (olng, olat, 1950.0d0, olng, olat)
if (pmflag == YES)
call sl_f45z (olng, olat, sl_epb(SKY_EPOCH(cooout)),
olng, olat)
else
call sl_f45z (olng, olat, sl_epb (SKY_EPOCH(cooin)),
olng, olat)
case EQTYPE_FK5:
if (pmflag == YES) {
call sl_pm (ilng, ilat, ipmlng, ipmlat, px, rv,
sl_epj (SKY_EPOCH(cooin)), sl_epj(SKY_EPOCH(cooout)),
olng, olat)
} else {
olng = ilng
olat = ilat
}
if (SKY_EQUINOX(cooin) != 2000.0d0)
call sl_prcs (2, SKY_EQUINOX(cooin), 2000.0d0, olng, olat)
case EQTYPE_ICRS:
if (pmflag == YES) {
call sl_pm (ilng, ilat, ipmlng, ipmlat, px, rv,
sl_epj (SKY_EPOCH(cooin)), sl_epj(SKY_EPOCH(cooout)),
olng, olat)
} else {
olng = ilng
olat = ilat
}
if (SKY_EQUINOX(cooin) != 2000.0d0)
call sl_prcs (2, SKY_EQUINOX(cooin), 2000.0d0, olng, olat)
call sl_hf5z (olng, olat, 2000.0d0, olng, olat, pmr, pmd)
case EQTYPE_GAPPT:
call sl_amp (ilng, ilat, SKY_EPOCH(cooin), 2000.0d0, olng, olat)
}
switch (SKY_CTYPE(cooout)) {
# The output coordinate system is ecliptic.
case CTYPE_ECLIPTIC:
call sl_eqec (olng, olat, SKY_EPOCH(cooout), olng, olat)
# The output coordinate system is galactic.
case CTYPE_GALACTIC:
call sl_eqga (olng, olat, olng, olat)
# The output coordinate system is supergalactic.
case CTYPE_SUPERGALACTIC:
call sl_eqga (olng, olat, olng, olat)
call sl_gasu (olng, olat, olng, olat)
default:
olng = ilng
olat = ilat
}
# The input coordinate system is ecliptic.
case CTYPE_ECLIPTIC:
call sl_eceq (ilng, ilat, SKY_EPOCH(cooin), olng, olat)
switch (SKY_CTYPE(cooout)) {
# The output coordinate system is equatorial.
case CTYPE_EQUATORIAL:
switch (SKY_RADECSYS(cooout)) {
case EQTYPE_FK4, EQTYPE_FK4NOE:
call sl_f54z (olng, olat, sl_epb(SKY_EPOCH(cooout)),
olng, olat, pmr, pmd)
call sl_suet (olng, olat, 1950.0d0, olng, olat)
if (SKY_EQUINOX(cooout) != 1950.0d0)
call sl_prcs (1, 1950.0d0, SKY_EQUINOX(cooout),
olng, olat)
if (SKY_RADECSYS(cooout) == EQTYPE_FK4)
call sl_adet (olng, olat, SKY_EQUINOX(cooout),
olng, olat)
case EQTYPE_FK5:
if (SKY_EQUINOX(cooout) != 2000.0d0)
call sl_prcs (2, 2000.0d0, SKY_EQUINOX(cooout),
olng, olat)
case EQTYPE_ICRS:
#call sl_f5hz (olng, olat, sl_epj(SKY_EPOCH(cooin)),
#olng, olat)
call sl_f5hz (olng, olat, 2000.0d0, olng, olat)
if (SKY_EQUINOX(cooout) != 2000.0d0)
call sl_prcs (2, 2000.0d0, SKY_EQUINOX(cooout),
olng, olat)
case EQTYPE_GAPPT:
call sl_map (olng, olat, 0.0d0, 0.0d0, px, 0.0d0,
2000.0d0, SKY_EPOCH(cooout), olng, olat)
}
# The output coordinate system is galactic.
case CTYPE_GALACTIC:
call sl_eqga (olng, olat, olng, olat)
# The output system is supergalactic.
case CTYPE_SUPERGALACTIC:
call sl_eqga (olng, olat, olng, olat)
call sl_gasu (olng, olat, olng, olat)
default:
olng = ilng
olat = ilat
}
# The input coordinate system is galactic.
case CTYPE_GALACTIC:
switch (SKY_CTYPE(cooout)) {
# The output coordinate system is equatorial.
case CTYPE_EQUATORIAL:
call sl_gaeq (ilng, ilat, olng, olat)
switch (SKY_RADECSYS(cooout)) {
case EQTYPE_FK4, EQTYPE_FK4NOE:
call sl_f54z (olng, olat, sl_epb(SKY_EPOCH(cooout)),
olng, olat, pmr, pmd)
call sl_suet (olng, olat, 1950.0d0, olng, olat)
if (SKY_EQUINOX(cooout) != 1950.0d0)
call sl_prcs (1, 1950.0d0, SKY_EQUINOX(cooout),
olng, olat)
if (SKY_RADECSYS(cooout) == EQTYPE_FK4)
call sl_adet (olng, olat, SKY_EQUINOX(cooout),
olng, olat)
case EQTYPE_FK5:
if (SKY_EQUINOX(cooout) != 2000.0d0)
call sl_prcs (2, 2000.0d0, SKY_EQUINOX(cooout),
olng, olat)
case EQTYPE_ICRS:
call sl_f5hz (olng, olat, 2000.0d0, olng, olat)
if (SKY_EQUINOX(cooout) != 2000.0d0)
call sl_prcs (2, 2000.0d0, SKY_EQUINOX(cooout),
olng, olat)
case EQTYPE_GAPPT:
call sl_map (olng, olat, 0.0d0, 0.0d0, px, 0.0d0,
2000.0d0, SKY_EPOCH(cooout), olng, olat)
}
# The output coordinate system is ecliptic.
case CTYPE_ECLIPTIC:
call sl_gaeq (ilng, ilat, olng, olat)
call sl_eqec (olng, olat, SKY_EPOCH(cooout), olng, olat)
# The output coordinate system is supergalactic.
case CTYPE_SUPERGALACTIC:
call sl_gasu (ilng, ilat, olng, olat)
default:
olng = ilng
olat = ilat
}
# The input coordinates are supergalactic.
case CTYPE_SUPERGALACTIC:
switch (SKY_CTYPE(cooout)) {
case CTYPE_EQUATORIAL:
call sl_suga (ilng, ilat, olng, olat)
switch (SKY_RADECSYS(cooout)) {
case EQTYPE_FK4:
call sl_gaeq (olng, olat, olng, olat)
call sl_f54z (olng, olat, sl_epb (SKY_EPOCH(cooout)),
olng, olat, pmr, pmd)
call sl_suet (olng, olat, 1950.0d0, olng, olat)
if (SKY_EQUINOX(cooout) != 1950.0d0)
call sl_prcs (1, 1950.0d0, SKY_EQUINOX(cooout),
olng, olat)
call sl_adet (olng, olat, SKY_EQUINOX(cooout), olng, olat)
case EQTYPE_FK4NOE:
call sl_gaeq (olng, olat, olng, olat)
call sl_f54z (olng, olat, sl_epb (SKY_EPOCH(cooout)),
olng, olat, pmr, pmd)
call sl_suet (olng, olat, 1950.0d0, olng, olat)
if (SKY_EQUINOX(cooout) != 1950.0d0)
call sl_prcs (1, 1950.0d0, SKY_EQUINOX(cooout),
olng, olat)
case EQTYPE_FK5:
call sl_gaeq (olng, olat, olng, olat)
if (SKY_EQUINOX(cooout) != 2000.0d0)
call sl_prcs (2, 2000.0d0, SKY_EQUINOX(cooout),
olng, olat)
case EQTYPE_ICRS:
call sl_gaeq (olng, olat, olng, olat)
call sl_f5hz (olng, olat, 2000.0d0, olng, olat)
if (SKY_EQUINOX(cooout) != 2000.0d0)
call sl_prcs (2, 2000.0d0, SKY_EQUINOX(cooout),
olng, olat)
case EQTYPE_GAPPT:
call sl_gaeq (olng, olat, olng, olat)
call sl_map (olng, olat, 0.0d0, 0.0d0, px, 0.0d0,
2000.0d0, SKY_EPOCH(cooout), olng, olat)
}
case CTYPE_ECLIPTIC:
call sl_suga (ilng, ilat, olng, olat)
call sl_gaeq (olng, olat, olng, olat)
call sl_eqec (olng, olat, SKY_EPOCH(cooout), olng, olat)
case CTYPE_GALACTIC:
call sl_suga (ilng, ilat, olng, olat)
default:
olng = ilng
olat = ilat
}
default:
olng = ilng
olat = ilat
}
end
# SK_EQUATORIAL -- Convert / precess equatorial coordinates.
procedure sk_equatorial (cooin, cooout, ilng, ilat, ipmlng, ipmlat,
px, rv, olng, olat)
pointer cooin #I the input coordinate system structure
pointer cooout #I the output coordinate system structure
double ilng #I the input ra in radians
double ilat #I the input dec in radians
double ipmlng #I the input proper motion in ra in radians
double ipmlat #I the input proper motion in dec in radians
double px #I the input parallax in arcseconds
double rv #I the input radial valocity in km / second
double olng #O the output ra in radians
double olat #O the output dec in radians
int pmflag
double pmr, pmd
double sl_epb(), sl_epj()
begin
# Check to see whether or not conversion / precession is necessary.
if ((SKY_RADECSYS(cooin) == SKY_RADECSYS(cooout)) &&
(SKY_EQUINOX(cooin) == SKY_EQUINOX(cooout)) &&
(SKY_EPOCH(cooin) == SKY_EPOCH(cooout))) {
olng = ilng
olat = ilat
return
}
# Compute proper motions ?
if (! IS_INDEFD(ipmlng) && ! IS_INDEFD(ipmlat))
pmflag = YES
else
pmflag = NO
switch (SKY_RADECSYS(cooin)) {
# The input coordinate system is FK4 with or without the E terms.
case EQTYPE_FK4, EQTYPE_FK4NOE:
if (pmflag == YES) {
call sl_pm (ilng, ilat, ipmlng, ipmlat, px, rv,
sl_epb (SKY_EPOCH(cooin)), sl_epb (SKY_EPOCH(cooout)),
olng, olat)
} else {
olng = ilng
olat = ilat
}
if (SKY_RADECSYS(cooin) == EQTYPE_FK4)
call sl_suet (olng, olat, SKY_EQUINOX(cooin), olng, olat)
if (SKY_EQUINOX(cooin) != 1950.0d0)
call sl_prcs (1, SKY_EQUINOX(cooin), 1950.0d0, olng, olat)
call sl_adet (olng, olat, 1950.0d0, olng, olat)
if (pmflag == YES)
call sl_f45z (olng, olat, sl_epb (SKY_EPOCH(cooout)),
olng, olat)
else
call sl_f45z (olng, olat, sl_epb (SKY_EPOCH(cooin)),
olng, olat)
switch (SKY_RADECSYS(cooout)) {
# The output coordinate system is FK4 with and without the E terms.
case EQTYPE_FK4, EQTYPE_FK4NOE:
call sl_f54z (olng, olat, sl_epb (SKY_EPOCH(cooout)),
olng, olat, pmr, pmd)
call sl_suet (olng, olat, 1950.0d0, olng, olat)
if (SKY_EQUINOX(cooout) != 1950.0d0)
call sl_prcs (1, 1950.0d0, SKY_EQUINOX(cooout),
olng, olat)
if (SKY_RADECSYS(cooout) == EQTYPE_FK4)
call sl_adet (olng, olat, SKY_EQUINOX(cooout), olng, olat)
# The output coordinate system is FK5.
case EQTYPE_FK5:
if (SKY_EQUINOX(cooout) != 2000.0d0)
call sl_prcs (2, 2000.0d0, SKY_EQUINOX(cooout), olng, olat)
# The output coordinate system is ICRS (Hipparcos).
case EQTYPE_ICRS:
call sl_f5hz (olng, olat, 2000.0d0, olng, olat)
if (SKY_EQUINOX(cooout) != 2000.0d0)
call sl_prcs (2, 2000.0d0, SKY_EQUINOX(cooout), olng, olat)
# The output coordinate system is geocentric apparent.
case EQTYPE_GAPPT:
call sl_map (olng, olat, 0.0d0, 0.0d0, px, 0.0d0, 2000.0d0,
SKY_EPOCH(cooout), olng, olat)
}
# The input coordinate system is FK5 or geocentric apparent.
case EQTYPE_FK5, EQTYPE_GAPPT:
if (SKY_RADECSYS(cooin) == EQTYPE_FK5) {
if (pmflag == YES) {
call sl_pm (ilng, ilat, ipmlng, ipmlat, px, rv,
sl_epj (SKY_EPOCH(cooin)), sl_epj (SKY_EPOCH(cooout)),
olng, olat)
} else {
olng = ilng
olat = ilat
}
} else
call sl_amp (ilng, ilat, SKY_EPOCH(cooin), 2000.0d0, olng, olat)
switch (SKY_RADECSYS(cooout)) {
# The output coordinate system is FK4 with or without the E terms.
case EQTYPE_FK4, EQTYPE_FK4NOE:
if (SKY_EQUINOX(cooin) != 2000.0d0)
call sl_prcs (2, SKY_EQUINOX(cooin), 2000.0d0, olng, olat)
call sl_f54z (olng, olat, sl_epb(SKY_EPOCH(cooout)),
olng, olat, pmr, pmd)
call sl_suet (olng, olat, 1950.0d0, olng, olat)
if (SKY_EQUINOX(cooout) != 1950.0d0)
call sl_prcs (1, 1950.0d0, SKY_EQUINOX(cooout), olng, olat)
if (SKY_RADECSYS(cooout) == EQTYPE_FK4)
call sl_adet (olng, olat, SKY_EQUINOX(cooout), olng, olat)
# The output coordinate system is FK5.
case EQTYPE_FK5:
if (SKY_EQUINOX(cooin) != SKY_EQUINOX(cooout))
call sl_prcs (2, SKY_EQUINOX(cooin), SKY_EQUINOX(cooout),
olng, olat)
# The output coordinate system is ICRS.
case EQTYPE_ICRS:
if (SKY_EQUINOX(cooin) != 2000.0d0)
call sl_prcs (2, SKY_EQUINOX(cooin), 2000.0d0, olng, olat)
call sl_f5hz (olng, olat, sl_epj(SKY_EPOCH(cooin)), olng, olat)
if (SKY_EQUINOX(cooout) != 2000.0d0)
call sl_prcs (2, 2000.0d0, SKY_EQUINOX(cooout), olng, olat)
# The output coordinate system is geocentric apparent.
case EQTYPE_GAPPT:
if (SKY_EQUINOX(cooin) != 2000.0d0)
call sl_prcs (2, SKY_EQUINOX(cooin), 2000.0d0, olng, olat)
call sl_map (olng, olat, 0.0d0, 0.0d0, px, 0.0d0, 2000.0d0,
SKY_EPOCH(cooout), olng, olat)
}
# The input coordinate system is ICRS.
case EQTYPE_ICRS:
if (pmflag == YES) {
call sl_pm (ilng, ilat, ipmlng, ipmlat, px, rv,
sl_epj (SKY_EPOCH(cooin)), sl_epj (SKY_EPOCH(cooout)),
olng, olat)
} else {
olng = ilng
olat = ilat
}
switch (SKY_RADECSYS(cooout)) {
# The output coordinate system is FK4 with or without the E terms.
case EQTYPE_FK4, EQTYPE_FK4NOE:
if (SKY_EQUINOX(cooin) != 2000.0d0)
call sl_prcs (2, SKY_EQUINOX(cooin), 2000.0d0, olng, olat)
call sl_hf5z (olng, olat, 2000.0d0, olng, olat,
pmr, pmd)
call sl_f54z (olng, olat, sl_epb(SKY_EPOCH(cooout)), olng, olat,
pmr, pmd)
call sl_suet (olng, olat, 1950.0d0, olng, olat)
if (SKY_EQUINOX(cooout) != 1950.0d0)
call sl_prcs (1, 1950.0d0, SKY_EQUINOX(cooout), olng, olat)
if (SKY_RADECSYS(cooout) == EQTYPE_FK4)
call sl_adet (olng, olat, SKY_EQUINOX(cooout), olng, olat)
# The output coordinate system is FK5.
case EQTYPE_FK5:
if (SKY_EQUINOX(cooin) != 2000.0d0)
call sl_prcs (2, SKY_EQUINOX(cooin), 2000.0d0, olng, olat)
call sl_hf5z (olng, olat, sl_epj(SKY_EPOCH(cooout)),
olng, olat, pmr, pmd)
if (SKY_EQUINOX(cooout) != 2000.0d0)
call sl_prcs (2, 2000.0d0, SKY_EQUINOX(cooout), olng, olat)
# The output coordinate system is ICRS.
case EQTYPE_ICRS:
if (SKY_EQUINOX(cooin) != SKY_EQUINOX(cooout))
call sl_prcs (2, SKY_EQUINOX(cooin), SKY_EQUINOX(cooout),
olng, olat)
# The output coordinate system is geocentric apparent.
case EQTYPE_GAPPT:
if (SKY_EQUINOX(cooin) != 2000.0d0)
call sl_prcs (2, SKY_EQUINOX(cooin), 2000.0d0, olng, olat)
call sl_hf5z (olng, olat, sl_epj(SKY_EPOCH(cooout)),
olng, olat, pmr, pmd)
call sl_map (olng, olat, 0.0d0, 0.0d0, px, 0.0d0, 2000.0d0,
SKY_EPOCH(cooout), olng, olat)
}
}
end
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