45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
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/*
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Define constants used, like the gravitational constant and unit conversions.
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Values are assigned in file constants.c
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All values are in SI units!
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*/
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#ifndef _TESSEROIDS_CONSTANTS_H_
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#define _TESSEROIDS_CONSTANTS_H_
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/* Mean Earth radius [\f$ m \f$] */
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extern const double MEAN_EARTH_RADIUS;
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/* The gravitational constant [\f$ m^3*kg^{-1}*s^{-1} \f$] */
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extern const double G;
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/* Conversion factor from SI units to Eotvos
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[\f$ \frac{1}{s^2} = 10^9\ Eotvos \f$] */
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extern const double SI2EOTVOS;
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/* Conversion factor from SI units to mGal
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[\f$ 1 \frac{m}{s^2} = 10^5\ mGal \f$] */
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extern const double SI2MGAL;
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/* Pi */
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extern const double PI;
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/* Minimum distance-to-size ratio for potential computations to be accurate */
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extern const double TESSEROID_POT_SIZE_RATIO;
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/* Minimum distance-to-size ratio for gravity computations to be accurate */
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extern const double TESSEROID_GX_SIZE_RATIO;
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extern const double TESSEROID_GY_SIZE_RATIO;
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extern const double TESSEROID_GZ_SIZE_RATIO;
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/* Minimum distance-to-size ratio for gravity gradient computations to be
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accurate */
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extern const double TESSEROID_GXX_SIZE_RATIO;
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extern const double TESSEROID_GXY_SIZE_RATIO;
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extern const double TESSEROID_GXZ_SIZE_RATIO;
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extern const double TESSEROID_GYY_SIZE_RATIO;
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extern const double TESSEROID_GYZ_SIZE_RATIO;
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extern const double TESSEROID_GZZ_SIZE_RATIO;
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#endif
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