mirror of
https://github.com/cosinekitty/astronomy.git
synced 2026-01-16 19:38:51 -05:00
6588e21d72
Relax apparent angular error threshold from 0.4 to 1.0 arcminutes. No longer compare TOP2013 to NOVAS while optimizing. Use worst-case distance between Earth and Pluto: Pluto radius from Sun, minus Earth aphelion distance. Sample 503 points intead of 293. Measure 2 full orbits before J2000 and 2 full orbits after J2000. Statistics for output/8.top : OptimizeTop: 268 terms [ 34 57 72 90 9 6]
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/*
|
|
top2013.h - Don Cross - 2020-06-30
|
|
|
|
Loads and calculates planetary positions using TOP2013 analytic models.
|
|
See: https://en.wikipedia.org/wiki/VSOP_(planets)
|
|
*/
|
|
#ifndef __DDC_TOP2013_H
|
|
#define __DDC_TOP2013_H
|
|
|
|
typedef struct
|
|
{
|
|
double k; /* mu coefficient */
|
|
double c; /* cosine coefficient */
|
|
double s; /* sine coefficient */
|
|
double p; /* period expressed in years */
|
|
int rc; /* hack: final digit rounding adjustment for 'c' */
|
|
int rs; /* hack: final digit rounding adjustment for 's' */
|
|
}
|
|
top_term_t;
|
|
|
|
|
|
typedef struct
|
|
{
|
|
int nterms_total;
|
|
int nterms_calc;
|
|
top_term_t *terms;
|
|
}
|
|
top_series_t;
|
|
|
|
#define TOP_NCOORDS 6
|
|
#define TOP_NSERIES 13
|
|
|
|
typedef struct
|
|
{
|
|
int planet; /* 5=Jupiter, 6=Saturn, 7=Uranus, 8=Neptune, 9=Pluto */
|
|
top_series_t series[TOP_NCOORDS][TOP_NSERIES];
|
|
}
|
|
top_model_t;
|
|
|
|
|
|
typedef struct
|
|
{
|
|
double a; /* AU */
|
|
double lambda; /* rad */
|
|
double k; /* 1 */
|
|
double h; /* 1 */
|
|
double q; /* 1 */
|
|
double p; /* 1 */
|
|
}
|
|
top_elliptical_t;
|
|
|
|
|
|
typedef struct
|
|
{
|
|
/* Position in AU */
|
|
double x;
|
|
double y;
|
|
double z;
|
|
|
|
/* velocity in AU/day */
|
|
double vx;
|
|
double vy;
|
|
double vz;
|
|
}
|
|
top_rectangular_t;
|
|
|
|
|
|
typedef struct
|
|
{
|
|
/* a sortable item that estimates how much a given term contributes to an elliptical element */
|
|
double magnitude;
|
|
int s;
|
|
int t;
|
|
}
|
|
top_contrib_t;
|
|
|
|
|
|
typedef struct
|
|
{
|
|
int nterms; /* the number of items in array */
|
|
int skip; /* the number of items requested to be skipped at the front of array */
|
|
top_contrib_t *array;
|
|
}
|
|
top_contrib_list_t;
|
|
|
|
|
|
typedef struct
|
|
{
|
|
/* an independent sortable list for each of the elliptical formulas */
|
|
top_contrib_list_t list[TOP_NCOORDS];
|
|
}
|
|
top_contrib_map_t;
|
|
|
|
|
|
typedef struct
|
|
{
|
|
double *array;
|
|
int length;
|
|
int offset;
|
|
long gencount;
|
|
}
|
|
top_random_buffer_t;
|
|
|
|
|
|
typedef struct
|
|
{
|
|
/* A normally distributed unit direction vector in 6-dimensional space. */
|
|
/* Used for searching for a small series that is accurate enough. */
|
|
double x[TOP_NCOORDS];
|
|
}
|
|
top_direction_t;
|
|
|
|
|
|
void TopInitModel(top_model_t *model);
|
|
void TopFreeModel(top_model_t *model);
|
|
int TopCloneModel(top_model_t *copy, const top_model_t* original);
|
|
int TopLoadModel(top_model_t *model, const char *filename, int planet);
|
|
int TopSaveModel(const top_model_t *model, const char *filename);
|
|
int TopWriteModel(const top_model_t *model, FILE *outfile);
|
|
int TopTermCount(const top_model_t *model);
|
|
int TopTermCountF(const top_model_t *model, int f);
|
|
int TopCalcElliptical(const top_model_t *model, double tt, top_elliptical_t *ellip);
|
|
int TopEcliptic(int planet, const top_elliptical_t *ellip, top_rectangular_t *ecl);
|
|
int TopEquatorial(const top_rectangular_t *ecl, top_rectangular_t *equ);
|
|
int TopPosition(const top_model_t *model, double tt, top_rectangular_t *equ);
|
|
|
|
void TopInitContribMap(top_contrib_map_t *map);
|
|
int TopMakeContribMap(top_contrib_map_t *map, const top_model_t *model, double millennia);
|
|
void TopFreeContribMap(top_contrib_map_t *map);
|
|
int TopSquash(top_model_t *copy, const top_model_t *original, const top_contrib_map_t *map);
|
|
|
|
int TopSetDistance(
|
|
top_model_t *copy,
|
|
top_contrib_map_t *map,
|
|
int *term_count,
|
|
const top_model_t *original,
|
|
double distance,
|
|
const top_direction_t *dir);
|
|
|
|
void TopInitRandomBuffer(top_random_buffer_t *buffer);
|
|
void TopFreeRandomBuffer(top_random_buffer_t *buffer);
|
|
int TopGetRandomNumber(top_random_buffer_t *buffer, double *r);
|
|
int TopGetDirection(top_direction_t *dir, top_random_buffer_t *buffer);
|
|
|
|
#endif /* __DDC_TOP2013_H */
|