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example.cpp
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example.cpp
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#include "ElpMpp02.h"
int main() {
Elp_facs facs;
Elp_paras paras;
Elp_coefs coefs;
int corr,i,n;
double X,Y,Z, JD0,JD,dJD, T0,T,dT;
//-----------------------------------------------------------------------
// Compute Lunar coordinates (J2000.0 mean ecliptic and equinox):
// 5 dates from JD 2444239.5 to 2452239.5,
// Time interval = 2000 days,
// Parameters fitted to LLR observations.
//-----------------------------------------------------------------------
corr = 0; // use parameters fitted to the LLR data
setup_parameters(corr, paras, facs);
setup_Elp_coefs(coefs, facs);
JD0 = 2444239.5;
dJD = 2000.0;
n = 5;
T0 = (JD0 - 2451545.0)/36525.0;
dT = dJD/36525.0;
printf("-------------------------------------------------------\n");
printf("Lunar coordinates (J2000.0 mean ecliptic and equinox):\n");
printf("5 dates from JD 2444239.5 to 2452239.5,\n");
printf("Time interval = 2000 days,\n");
printf("Parameters fitted to LLR observations.\n");
printf("-------------------------------------------------------\n");
for (i=0; i<n; i++) {
JD = JD0 + i*dJD;
T = T0 + i*dT;
getX2000(T, paras, coefs, X,Y,Z);
printf("JD: %f\n", JD);
printf("X, Y, Z (km): %f %f %f\n\n\n", X,Y,Z);
}
//-----------------------------------------------------------------------
// Compute Lunar coordinates (J2000.0 mean ecliptic and equinox):
// 5 dates from JD 2500000.5 to 1700000.5,
// Time interval = -200000 days,
// Parameters fitted to JPL ephemeris DE405/DE406.
//-----------------------------------------------------------------------
corr = 1; // use parameters fitted to DE405
setup_parameters(corr, paras, facs);
setup_Elp_coefs(coefs, facs);
JD0 = 2500000.5;
dJD = -2e5;
n = 5;
T0 = (JD0 - 2451545.0)/36525.0;
dT = dJD/36525.0;
printf("-------------------------------------------------------\n");
printf("Lunar coordinates (J2000.0 mean ecliptic and equinox):\n");
printf("5 dates from JD 2500000.5 to 1700000.5,\n");
printf("Time interval = -200000 days,\n");
printf("Parameters fitted to JPL ephemeris DE405/DE406.\n");
printf("-------------------------------------------------------\n");
for (i=0; i<n; i++) {
JD = JD0 + i*dJD;
T = T0 + i*dT;
getX2000(T, paras, coefs, X,Y,Z);
printf("JD: %f\n", JD);
printf("X, Y, Z (km): %f %f %f\n\n", X,Y,Z);
}
return 0;
}