#ifndef SOFAMHDEF #define SOFAMHDEF /* ** - - - - - - - - ** s o f a m . h ** - - - - - - - - ** ** Macros used by SOFA library. ** ** This file is part of the International Astronomical Union's ** SOFA (Standards Of Fundamental Astronomy) software collection. ** ** Please note that the constants defined below are to be used only in ** the context of the SOFA software, and have no other official IAU ** status. In addition, self consistency is not guaranteed. ** ** This revision: 2017 March 16 ** ** SOFA release 2017-04-20 ** ** Copyright (C) 2017 IAU SOFA Board. See notes at end. */ /* Star-independent astrometry parameters */ typedef struct { double pmt; /* PM time interval (SSB, Julian years) */ double eb[3]; /* SSB to observer (vector, au) */ double eh[3]; /* Sun to observer (unit vector) */ double em; /* distance from Sun to observer (au) */ double v[3]; /* barycentric observer velocity (vector, c) */ double bm1; /* sqrt(1-|v|^2): reciprocal of Lorenz factor */ double bpn[3][3]; /* bias-precession-nutation matrix */ double along; /* longitude + s' + dERA(DUT) (radians) */ double phi; /* geodetic latitude (radians) */ double xpl; /* polar motion xp wrt local meridian (radians) */ double ypl; /* polar motion yp wrt local meridian (radians) */ double sphi; /* sine of geodetic latitude */ double cphi; /* cosine of geodetic latitude */ double diurab; /* magnitude of diurnal aberration vector */ double eral; /* "local" Earth rotation angle (radians) */ double refa; /* refraction constant A (radians) */ double refb; /* refraction constant B (radians) */ } iauASTROM; /* (Vectors eb, eh, em and v are all with respect to BCRS axes.) */ /* Body parameters for light deflection */ typedef struct { double bm; /* mass of the body (solar masses) */ double dl; /* deflection limiter (radians^2/2) */ double pv[2][3]; /* barycentric PV of the body (au, au/day) */ } iauLDBODY; /* Pi */ #define DPI (3.141592653589793238462643) /* 2Pi */ #define D2PI (6.283185307179586476925287) /* Radians to degrees */ #define DR2D (57.29577951308232087679815) /* Degrees to radians */ #define DD2R (1.745329251994329576923691e-2) /* Radians to arcseconds */ #define DR2AS (206264.8062470963551564734) /* Arcseconds to radians */ #define DAS2R (4.848136811095359935899141e-6) /* Seconds of time to radians */ #define DS2R (7.272205216643039903848712e-5) /* Arcseconds in a full circle */ #define TURNAS (1296000.0) /* Milliarcseconds to radians */ #define DMAS2R (DAS2R / 1e3) /* Length of tropical year B1900 (days) */ #define DTY (365.242198781) /* Seconds per day. */ #define DAYSEC (86400.0) /* Days per Julian year */ #define DJY (365.25) /* Days per Julian century */ #define DJC (36525.0) /* Days per Julian millennium */ #define DJM (365250.0) /* Reference epoch (J2000.0), Julian Date */ #define DJ00 (2451545.0) /* Julian Date of Modified Julian Date zero */ #define DJM0 (2400000.5) /* Reference epoch (J2000.0), Modified Julian Date */ #define DJM00 (51544.5) /* 1977 Jan 1.0 as MJD */ #define DJM77 (43144.0) /* TT minus TAI (s) */ #define TTMTAI (32.184) /* Astronomical unit (m, IAU 2012) */ #define DAU (149597870.7e3) /* Speed of light (m/s) */ #define CMPS 299792458.0 /* Light time for 1 au (s) */ #define AULT (DAU/CMPS) /* Speed of light (au per day) */ #define DC (DAYSEC/AULT) /* L_G = 1 - d(TT)/d(TCG) */ #define ELG (6.969290134e-10) /* L_B = 1 - d(TDB)/d(TCB), and TDB (s) at TAI 1977/1/1.0 */ #define ELB (1.550519768e-8) #define TDB0 (-6.55e-5) /* Schwarzschild radius of the Sun (au) */ /* = 2 * 1.32712440041e20 / (2.99792458e8)^2 / 1.49597870700e11 */ #define SRS 1.97412574336e-8 /* dint(A) - truncate to nearest whole number towards zero (double) */ #define dint(A) ((A)<0.0?ceil(A):floor(A)) /* dnint(A) - round to nearest whole number (double) */ #define dnint(A) ((A)<0.0?ceil((A)-0.5):floor((A)+0.5)) /* dsign(A,B) - magnitude of A with sign of B (double) */ #define dsign(A,B) ((B)<0.0?-fabs(A):fabs(A)) /* max(A,B) - larger (most +ve) of two numbers (generic) */ #define gmax(A,B) (((A)>(B))?(A):(B)) /* min(A,B) - smaller (least +ve) of two numbers (generic) */ #define gmin(A,B) (((A)<(B))?(A):(B)) /* Reference ellipsoids */ #define WGS84 1 #define GRS80 2 #define WGS72 3 #endif /*---------------------------------------------------------------------- ** ** Copyright (C) 2017 ** Standards Of Fundamental Astronomy Board ** of the International Astronomical Union. ** ** ===================== ** SOFA Software License ** ===================== ** ** NOTICE TO USER: ** ** BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING SIX TERMS AND ** CONDITIONS WHICH APPLY TO ITS USE. ** ** 1. The Software is owned by the IAU SOFA Board ("SOFA"). ** ** 2. Permission is granted to anyone to use the SOFA software for any ** purpose, including commercial applications, free of charge and ** without payment of royalties, subject to the conditions and ** restrictions listed below. ** ** 3. You (the user) may copy and distribute SOFA source code to others, ** and use and adapt its code and algorithms in your own software, ** on a world-wide, royalty-free basis. That portion of your ** distribution that does not consist of intact and unchanged copies ** of SOFA source code files is a "derived work" that must comply ** with the following requirements: ** ** a) Your work shall be marked or carry a statement that it ** (i) uses routines and computations derived by you from ** software provided by SOFA under license to you; and ** (ii) does not itself constitute software provided by and/or ** endorsed by SOFA. ** ** b) The source code of your derived work must contain descriptions ** of how the derived work is based upon, contains and/or differs ** from the original SOFA software. ** ** c) The names of all routines in your derived work shall not ** include the prefix "iau" or "sofa" or trivial modifications ** thereof such as changes of case. ** ** d) The origin of the SOFA components of your derived work must ** not be misrepresented; you must not claim that you wrote the ** original software, nor file a patent application for SOFA ** software or algorithms embedded in the SOFA software. ** ** e) These requirements must be reproduced intact in any source ** distribution and shall apply to anyone to whom you have ** granted a further right to modify the source code of your ** derived work. ** ** Note that, as originally distributed, the SOFA software is ** intended to be a definitive implementation of the IAU standards, ** and consequently third-party modifications are discouraged. All ** variations, no matter how minor, must be explicitly marked as ** such, as explained above. ** ** 4. You shall not cause the SOFA software to be brought into ** disrepute, either by misuse, or use for inappropriate tasks, or ** by inappropriate modification. ** ** 5. The SOFA software is provided "as is" and SOFA makes no warranty ** as to its use or performance. SOFA does not and cannot warrant ** the performance or results which the user may obtain by using the ** SOFA software. SOFA makes no warranties, express or implied, as ** to non-infringement of third party rights, merchantability, or ** fitness for any particular purpose. In no event will SOFA be ** liable to the user for any consequential, incidental, or special ** damages, including any lost profits or lost savings, even if a ** SOFA representative has been advised of such damages, or for any ** claim by any third party. ** ** 6. The provision of any version of the SOFA software under the terms ** and conditions specified herein does not imply that future ** versions will also be made available under the same terms and ** conditions. * ** In any published work or commercial product which uses the SOFA ** software directly, acknowledgement (see www.iausofa.org) is ** appreciated. ** ** Correspondence concerning SOFA software should be addressed as ** follows: ** ** By email: sofa@ukho.gov.uk ** By post: IAU SOFA Center ** HM Nautical Almanac Office ** UK Hydrographic Office ** Admiralty Way, Taunton ** Somerset, TA1 2DN ** United Kingdom ** **--------------------------------------------------------------------*/