| 1 | #ifndef ERFAMHDEF
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| 2 | #define ERFAMHDEF
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| 3 |
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| 4 | /*
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| 5 | ** - - - - - - - -
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| 6 | ** e r f a m . h
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| 7 | ** - - - - - - - -
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| 8 | **
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| 9 | ** Macros used by ERFA library.
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| 10 | **
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| 11 | ** Copyright (C) 2013-2016, NumFOCUS Foundation.
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| 12 | ** Derived, with permission, from the SOFA library. See notes at end of file.
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| 13 | */
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| 14 |
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| 15 | /* Star-independent astrometry parameters */
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| 16 | typedef struct {
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| 17 | double pmt; /* PM time interval (SSB, Julian years) */
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| 18 | double eb[3]; /* SSB to observer (vector, au) */
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| 19 | double eh[3]; /* Sun to observer (unit vector) */
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| 20 | double em; /* distance from Sun to observer (au) */
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| 21 | double v[3]; /* barycentric observer velocity (vector, c) */
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| 22 | double bm1; /* sqrt(1-|v|^2): reciprocal of Lorenz factor */
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| 23 | double bpn[3][3]; /* bias-precession-nutation matrix */
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| 24 | double along; /* longitude + s' + dERA(DUT) (radians) */
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| 25 | double phi; /* geodetic latitude (radians) */
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| 26 | double xpl; /* polar motion xp wrt local meridian (radians) */
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| 27 | double ypl; /* polar motion yp wrt local meridian (radians) */
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| 28 | double sphi; /* sine of geodetic latitude */
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| 29 | double cphi; /* cosine of geodetic latitude */
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| 30 | double diurab; /* magnitude of diurnal aberration vector */
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| 31 | double eral; /* "local" Earth rotation angle (radians) */
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| 32 | double refa; /* refraction constant A (radians) */
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| 33 | double refb; /* refraction constant B (radians) */
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| 34 | } eraASTROM;
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| 35 | /* (Vectors eb, eh, em and v are all with respect to BCRS axes.) */
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| 36 |
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| 37 | /* Body parameters for light deflection */
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| 38 | typedef struct {
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| 39 | double bm; /* mass of the body (solar masses) */
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| 40 | double dl; /* deflection limiter (radians^2/2) */
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| 41 | double pv[2][3]; /* barycentric PV of the body (au, au/day) */
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| 42 | } eraLDBODY;
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| 43 |
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| 44 | /* Pi */
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| 45 | #define ERFA_DPI (3.141592653589793238462643)
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| 46 |
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| 47 | /* 2Pi */
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| 48 | #define ERFA_D2PI (6.283185307179586476925287)
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| 49 |
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| 50 | /* Radians to degrees */
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| 51 | #define ERFA_DR2D (57.29577951308232087679815)
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| 52 |
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| 53 | /* Degrees to radians */
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| 54 | #define ERFA_DD2R (1.745329251994329576923691e-2)
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| 55 |
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| 56 | /* Radians to arcseconds */
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| 57 | #define ERFA_DR2AS (206264.8062470963551564734)
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| 58 |
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| 59 | /* Arcseconds to radians */
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| 60 | #define ERFA_DAS2R (4.848136811095359935899141e-6)
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| 61 |
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| 62 | /* Seconds of time to radians */
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| 63 | #define ERFA_DS2R (7.272205216643039903848712e-5)
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| 64 |
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| 65 | /* Arcseconds in a full circle */
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| 66 | #define ERFA_TURNAS (1296000.0)
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| 67 |
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| 68 | /* Milliarcseconds to radians */
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| 69 | #define ERFA_DMAS2R (ERFA_DAS2R / 1e3)
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| 70 |
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| 71 | /* Length of tropical year B1900 (days) */
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| 72 | #define ERFA_DTY (365.242198781)
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| 73 |
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| 74 | /* Seconds per day. */
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| 75 | #define ERFA_DAYSEC (86400.0)
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| 76 |
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| 77 | /* Days per Julian year */
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| 78 | #define ERFA_DJY (365.25)
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| 79 |
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| 80 | /* Days per Julian century */
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| 81 | #define ERFA_DJC (36525.0)
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| 82 |
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| 83 | /* Days per Julian millennium */
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| 84 | #define ERFA_DJM (365250.0)
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| 85 |
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| 86 | /* Reference epoch (J2000.0), Julian Date */
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| 87 | #define ERFA_DJ00 (2451545.0)
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| 88 |
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| 89 | /* Julian Date of Modified Julian Date zero */
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| 90 | #define ERFA_DJM0 (2400000.5)
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| 91 |
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| 92 | /* Reference epoch (J2000.0), Modified Julian Date */
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| 93 | #define ERFA_DJM00 (51544.5)
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| 94 |
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| 95 | /* 1977 Jan 1.0 as MJD */
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| 96 | #define ERFA_DJM77 (43144.0)
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| 97 |
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| 98 | /* TT minus TAI (s) */
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| 99 | #define ERFA_TTMTAI (32.184)
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| 100 |
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| 101 | /* Astronomical unit (m) */
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| 102 | #define ERFA_DAU (149597870e3)
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| 103 |
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| 104 | /* Speed of light (m/s) */
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| 105 | #define ERFA_CMPS 299792458.0
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| 106 |
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| 107 | /* Light time for 1 au (s) */
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| 108 | #define ERFA_AULT 499.004782
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| 109 |
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| 110 | /* Speed of light (AU per day) */
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| 111 | #define ERFA_DC (ERFA_DAYSEC / ERFA_AULT)
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| 112 |
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| 113 | /* L_G = 1 - d(TT)/d(TCG) */
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| 114 | #define ERFA_ELG (6.969290134e-10)
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| 115 |
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| 116 | /* L_B = 1 - d(TDB)/d(TCB), and TDB (s) at TAI 1977/1/1.0 */
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| 117 | #define ERFA_ELB (1.550519768e-8)
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| 118 | #define ERFA_TDB0 (-6.55e-5)
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| 119 |
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| 120 | /* Schwarzschild radius of the Sun (au) */
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| 121 | /* = 2 * 1.32712440041e20 / (2.99792458e8)^2 / 1.49597870700e11 */
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| 122 | #define ERFA_SRS 1.97412574336e-8
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| 123 |
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| 124 | /* ERFA_DINT(A) - truncate to nearest whole number towards zero (double) */
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| 125 | #define ERFA_DINT(A) ((A)<0.0?ceil(A):floor(A))
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| 126 |
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| 127 | /* ERFA_DNINT(A) - round to nearest whole number (double) */
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| 128 | #define ERFA_DNINT(A) ((A)<0.0?ceil((A)-0.5):floor((A)+0.5))
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| 129 |
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| 130 | /* ERFA_DSIGN(A,B) - magnitude of A with sign of B (double) */
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| 131 | #define ERFA_DSIGN(A,B) ((B)<0.0?-fabs(A):fabs(A))
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| 132 |
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| 133 | /* max(A,B) - larger (most +ve) of two numbers (generic) */
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| 134 | #define ERFA_GMAX(A,B) (((A)>(B))?(A):(B))
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| 135 |
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| 136 | /* min(A,B) - smaller (least +ve) of two numbers (generic) */
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| 137 | #define ERFA_GMIN(A,B) (((A)<(B))?(A):(B))
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| 138 |
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| 139 | /* Reference ellipsoids */
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| 140 | #define ERFA_WGS84 1
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| 141 | #define ERFA_GRS80 2
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| 142 | #define ERFA_WGS72 3
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| 143 |
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| 144 | #endif
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| 145 |
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| 146 |
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| 147 | /*----------------------------------------------------------------------
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| 148 | **
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| 149 | **
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| 150 | ** Copyright (C) 2013-2016, NumFOCUS Foundation.
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| 151 | ** All rights reserved.
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| 152 | **
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| 153 | ** This library is derived, with permission, from the International
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| 154 | ** Astronomical Union's "Standards of Fundamental Astronomy" library,
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| 155 | ** available from http://www.iausofa.org.
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| 156 | **
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| 157 | ** The ERFA version is intended to retain identical functionality to
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| 158 | ** the SOFA library, but made distinct through different function and
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| 159 | ** file names, as set out in the SOFA license conditions. The SOFA
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| 160 | ** original has a role as a reference standard for the IAU and IERS,
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| 161 | ** and consequently redistribution is permitted only in its unaltered
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| 162 | ** state. The ERFA version is not subject to this restriction and
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| 163 | ** therefore can be included in distributions which do not support the
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| 164 | ** concept of "read only" software.
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| 165 | **
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| 166 | ** Although the intent is to replicate the SOFA API (other than
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| 167 | ** replacement of prefix names) and results (with the exception of
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| 168 | ** bugs; any that are discovered will be fixed), SOFA is not
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| 169 | ** responsible for any errors found in this version of the library.
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| 170 | **
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| 171 | ** If you wish to acknowledge the SOFA heritage, please acknowledge
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| 172 | ** that you are using a library derived from SOFA, rather than SOFA
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| 173 | ** itself.
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| 174 | **
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| 175 | **
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| 176 | ** TERMS AND CONDITIONS
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| 177 | **
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| 178 | ** Redistribution and use in source and binary forms, with or without
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| 179 | ** modification, are permitted provided that the following conditions
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| 180 | ** are met:
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| 181 | **
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| 182 | ** 1 Redistributions of source code must retain the above copyright
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| 183 | ** notice, this list of conditions and the following disclaimer.
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| 184 | **
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| 185 | ** 2 Redistributions in binary form must reproduce the above copyright
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| 186 | ** notice, this list of conditions and the following disclaimer in
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| 187 | ** the documentation and/or other materials provided with the
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| 188 | ** distribution.
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| 189 | **
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| 190 | ** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
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| 191 | ** the International Astronomical Union nor the names of its
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| 192 | ** contributors may be used to endorse or promote products derived
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| 193 | ** from this software without specific prior written permission.
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| 194 | **
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| 195 | ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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| 196 | ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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| 197 | ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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| 198 | ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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| 199 | ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 200 | ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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| 201 | ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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| 202 | ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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| 203 | ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 204 | ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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| 205 | ** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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| 206 | ** POSSIBILITY OF SUCH DAMAGE.
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| 207 | **
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| 208 | */
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