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/***********************************************/
/**
* @file constants.h
*
* @brief define constants.
*
* Constants are only valid after call of main().
* New constants must be set in inputOutput/settings.cpp.
*
* @author Torsten Mayer-Guerr
* @date 2010-03-01
*
*/
/***********************************************/
#ifndef __GROOPS_CONSTANTS__
#define __GROOPS_CONSTANTS__
#include "base/importStd.h"
/**
* @defgroup constants Constants
* @brief General constants used in groops.
* @ingroup base
* Constants can be overwritten with groopsDefaults.xml file on input. */
// @{
/***** CONST ***********************************/
constexpr Double PI = 3.141592653589793238462643383279502884; //!< 3.1415.
constexpr Double RAD2DEG = 180.0/PI; //!< Conversion radian -> degree
constexpr Double DEG2RAD = PI/180.0; //!< Conversion degree -> radian.
constexpr UInt MAX_UINT = 4294967295U; //!< max. representable integer number.
constexpr UInt INFINITYDEGREE = MAX_UINT; //!< infinity polynomial/harmonics degree.
constexpr UInt NULLINDEX = MAX_UINT; //!< undefined index.
constexpr Double NAN_EXPR = std::numeric_limits<Double>::has_quiet_NaN ? std::numeric_limits<Double>::quiet_NaN() : NAN; //!< not a number symbol
[[deprecated("Use RAD2DEG instead (or 1/RHO -> RAD2DEG")]] constexpr Double RHO = RAD2DEG;
extern Double LIGHT_VELOCITY; //!< speed of light [m/s].
/***** DEFAULTS ********************************/
extern std::string STRING_DEFAULT_GM; //!< Gravitational constant of the Earth (EGM96).
extern std::string STRING_DEFAULT_R; //!< Reference radius (EGM96).
extern std::string STRING_DEFAULT_GRS80_a; //!< Semi major axis of Earth's ellipsoid.
extern std::string STRING_DEFAULT_GRS80_f; //!< inverse flattening of Earth's ellipsoid.
extern Double DEFAULT_GM; //!< Gravitational constant of the Earth (EGM96).
extern Double DEFAULT_R; //!< Reference radius (EGM96).
extern Double DEFAULT_GRS80_a; //!< Semi major axis of Earth's ellipsoid.
extern Double DEFAULT_GRS80_f; //!< inverse flattening of Earth's ellipsoid.
/***** CONSTANTS for Planets and Tides *********/
extern Double GRAVITATIONALCONSTANT; //!< Gravitational constant 6.673e-11.
extern Double R_Earth; //!< Earth radius (Used in Planets).
extern Double R_Moon; //!< Moon radius.
extern Double GM_Earth; //!< Gravitational constant of the Earth (Used in Planets).
extern Double GM_Sun; //!< Gravitational constant of the sun (Used in Planets).
extern Double GM_Moon; //!< Gravitational constant of the moon (Used in Planets).
extern Double GM_MERCURY; //!< Gravitational constant of mercury (Used in Planets).
extern Double GM_VENUS; //!< Gravitational constant of venus (Used in Planets).
extern Double GM_MARS; //!< Gravitational constant of mars (Used in Planets).
extern Double GM_JUPITER; //!< Gravitational constant of jupiter (Used in Planets).
extern Double GM_SATURN; //!< Gravitational constant of saturn (Used in Planets).
/***** Ionosphere ******************************/
namespace Ionosphere
{
constexpr Double e0 = 8.854187817e-12; //!< Permittivity of free space [F/m].
constexpr Double me = 9.1093835611e-31; //!< Electron mass [kg]
constexpr Double E = -1.602176634e-19; //!< Electron charge [C]
constexpr Double Ap = 1e16*(E*E/(4*PI*PI*e0*me))/2; //!< 40.3e16 in [TECU -> m]
}
/***** TIME SHIFTS *****************************/
extern Double TIME_EPSILON; //!< Margin to consider two times identical [seconds].
extern Double DELTA_TAI_GPS; //!< Seconds to be added to GPS time to get TAI.
extern Double DELTA_TT_GPS; //!< Seconds to be added to GPS time to get TT.
extern Double J2000; //!< J2000 in mjd
extern std::string STRING_J2000; //!< J2000 in mjd
extern std::vector<Int> MJD_UTC_GPS; //!< Time of new introduced leap second.
extern std::vector<Double> DELTA_UTC_GPS; //!< Leap seconds.
// @} group constants
/***********************************************/
#endif /* __GROOPS__ */
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