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Diffstat (limited to 'ast/erfa/atoiq.c')
| -rw-r--r-- | ast/erfa/atoiq.c | 260 |
1 files changed, 0 insertions, 260 deletions
diff --git a/ast/erfa/atoiq.c b/ast/erfa/atoiq.c deleted file mode 100644 index d5501a7..0000000 --- a/ast/erfa/atoiq.c +++ /dev/null @@ -1,260 +0,0 @@ -#include "erfa.h" - -void eraAtoiq(const char *type, - double ob1, double ob2, eraASTROM *astrom, - double *ri, double *di) -/* -** - - - - - - - - - -** e r a A t o i q -** - - - - - - - - - -** -** Quick observed place to CIRS, given the star-independent astrometry -** parameters. -** -** Use of this function is appropriate when efficiency is important and -** where many star positions are all to be transformed for one date. -** The star-independent astrometry parameters can be obtained by -** calling eraApio[13] or eraApco[13]. -** -** Given: -** type char[] type of coordinates: "R", "H" or "A" (Note 1) -** ob1 double observed Az, HA or RA (radians; Az is N=0,E=90) -** ob2 double observed ZD or Dec (radians) -** astrom eraASTROM* star-independent astrometry parameters: -** pmt double PM time interval (SSB, Julian years) -** eb double[3] SSB to observer (vector, au) -** eh double[3] Sun to observer (unit vector) -** em double distance from Sun to observer (au) -** v double[3] barycentric observer velocity (vector, c) -** bm1 double sqrt(1-|v|^2): reciprocal of Lorenz factor -** bpn double[3][3] bias-precession-nutation matrix -** along double longitude + s' (radians) -** xpl double polar motion xp wrt local meridian (radians) -** ypl double polar motion yp wrt local meridian (radians) -** sphi double sine of geodetic latitude -** cphi double cosine of geodetic latitude -** diurab double magnitude of diurnal aberration vector -** eral double "local" Earth rotation angle (radians) -** refa double refraction constant A (radians) -** refb double refraction constant B (radians) -** -** Returned: -** ri double* CIRS right ascension (CIO-based, radians) -** di double* CIRS declination (radians) -** -** Notes: -** -** 1) "Observed" Az,El means the position that would be seen by a -** perfect geodetically aligned theodolite. This is related to -** the observed HA,Dec via the standard rotation, using the geodetic -** latitude (corrected for polar motion), while the observed HA and -** RA are related simply through the Earth rotation angle and the -** site longitude. "Observed" RA,Dec or HA,Dec thus means the -** position that would be seen by a perfect equatorial with its -** polar axis aligned to the Earth's axis of rotation. By removing -** from the observed place the effects of atmospheric refraction and -** diurnal aberration, the CIRS RA,Dec is obtained. -** -** 2) Only the first character of the type argument is significant. -** "R" or "r" indicates that ob1 and ob2 are the observed right -** ascension and declination; "H" or "h" indicates that they are -** hour angle (west +ve) and declination; anything else ("A" or -** "a" is recommended) indicates that ob1 and ob2 are azimuth (north -** zero, east 90 deg) and zenith distance. (Zenith distance is used -** rather than altitude in order to reflect the fact that no -** allowance is made for depression of the horizon.) -** -** 3) The accuracy of the result is limited by the corrections for -** refraction, which use a simple A*tan(z) + B*tan^3(z) model. -** Providing the meteorological parameters are known accurately and -** there are no gross local effects, the predicted observed -** coordinates should be within 0.05 arcsec (optical) or 1 arcsec -** (radio) for a zenith distance of less than 70 degrees, better -** than 30 arcsec (optical or radio) at 85 degrees and better than -** 20 arcmin (optical) or 30 arcmin (radio) at the horizon. -** -** Without refraction, the complementary functions eraAtioq and -** eraAtoiq are self-consistent to better than 1 microarcsecond all -** over the celestial sphere. With refraction included, consistency -** falls off at high zenith distances, but is still better than -** 0.05 arcsec at 85 degrees. -** -** 4) It is advisable to take great care with units, as even unlikely -** values of the input parameters are accepted and processed in -** accordance with the models used. -** -** Called: -** eraS2c spherical coordinates to unit vector -** eraC2s p-vector to spherical -** eraAnp normalize angle into range 0 to 2pi -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - int c; - double c1, c2, sphi, cphi, ce, xaeo, yaeo, zaeo, v[3], - xmhdo, ymhdo, zmhdo, az, sz, zdo, refa, refb, tz, dref, - zdt, xaet, yaet, zaet, xmhda, ymhda, zmhda, - f, xhd, yhd, zhd, xpl, ypl, w, hma; - - -/* Coordinate type. */ - c = (int) type[0]; - -/* Coordinates. */ - c1 = ob1; - c2 = ob2; - -/* Sin, cos of latitude. */ - sphi = astrom->sphi; - cphi = astrom->cphi; - -/* Standardize coordinate type. */ - if ( c == 'r' || c == 'R' ) { - c = 'R'; - } else if ( c == 'h' || c == 'H' ) { - c = 'H'; - } else { - c = 'A'; - } - -/* If Az,ZD, convert to Cartesian (S=0,E=90). */ - if ( c == 'A' ) { - ce = sin(c2); - xaeo = - cos(c1) * ce; - yaeo = sin(c1) * ce; - zaeo = cos(c2); - - } else { - - /* If RA,Dec, convert to HA,Dec. */ - if ( c == 'R' ) c1 = astrom->eral - c1; - - /* To Cartesian -HA,Dec. */ - eraS2c ( -c1, c2, v ); - xmhdo = v[0]; - ymhdo = v[1]; - zmhdo = v[2]; - - /* To Cartesian Az,El (S=0,E=90). */ - xaeo = sphi*xmhdo - cphi*zmhdo; - yaeo = ymhdo; - zaeo = cphi*xmhdo + sphi*zmhdo; - } - -/* Azimuth (S=0,E=90). */ - az = ( xaeo != 0.0 || yaeo != 0.0 ) ? atan2(yaeo,xaeo) : 0.0; - -/* Sine of observed ZD, and observed ZD. */ - sz = sqrt ( xaeo*xaeo + yaeo*yaeo ); - zdo = atan2 ( sz, zaeo ); - -/* -** Refraction -** ---------- -*/ - -/* Fast algorithm using two constant model. */ - refa = astrom->refa; - refb = astrom->refb; - tz = sz / zaeo; - dref = ( refa + refb*tz*tz ) * tz; - zdt = zdo + dref; - -/* To Cartesian Az,ZD. */ - ce = sin(zdt); - xaet = cos(az) * ce; - yaet = sin(az) * ce; - zaet = cos(zdt); - -/* Cartesian Az,ZD to Cartesian -HA,Dec. */ - xmhda = sphi*xaet + cphi*zaet; - ymhda = yaet; - zmhda = - cphi*xaet + sphi*zaet; - -/* Diurnal aberration. */ - f = ( 1.0 + astrom->diurab*ymhda ); - xhd = f * xmhda; - yhd = f * ( ymhda - astrom->diurab ); - zhd = f * zmhda; - -/* Polar motion. */ - xpl = astrom->xpl; - ypl = astrom->ypl; - w = xpl*xhd - ypl*yhd + zhd; - v[0] = xhd - xpl*w; - v[1] = yhd + ypl*w; - v[2] = w - ( xpl*xpl + ypl*ypl ) * zhd; - -/* To spherical -HA,Dec. */ - eraC2s(v, &hma, di); - -/* Right ascension. */ - *ri = eraAnp(astrom->eral + hma); - -/* Finished. */ - -} -/*---------------------------------------------------------------------- -** -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** All rights reserved. -** -** This library is derived, with permission, from the International -** Astronomical Union's "Standards of Fundamental Astronomy" library, -** available from http://www.iausofa.org. -** -** The ERFA version is intended to retain identical functionality to -** the SOFA library, but made distinct through different function and -** file names, as set out in the SOFA license conditions. The SOFA -** original has a role as a reference standard for the IAU and IERS, -** and consequently redistribution is permitted only in its unaltered -** state. The ERFA version is not subject to this restriction and -** therefore can be included in distributions which do not support the -** concept of "read only" software. -** -** Although the intent is to replicate the SOFA API (other than -** replacement of prefix names) and results (with the exception of -** bugs; any that are discovered will be fixed), SOFA is not -** responsible for any errors found in this version of the library. -** -** If you wish to acknowledge the SOFA heritage, please acknowledge -** that you are using a library derived from SOFA, rather than SOFA -** itself. -** -** -** TERMS AND CONDITIONS -** -** Redistribution and use in source and binary forms, with or without -** modification, are permitted provided that the following conditions -** are met: -** -** 1 Redistributions of source code must retain the above copyright -** notice, this list of conditions and the following disclaimer. -** -** 2 Redistributions in binary form must reproduce the above copyright -** notice, this list of conditions and the following disclaimer in -** the documentation and/or other materials provided with the -** distribution. -** -** 3 Neither the name of the Standards Of Fundamental Astronomy Board, -** the International Astronomical Union nor the names of its -** contributors may be used to endorse or promote products derived -** from this software without specific prior written permission. -** -** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS -** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE -** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, -** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, -** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER -** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN -** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -** POSSIBILITY OF SUCH DAMAGE. -** -*/ |