html/cpp/md_SuperNOVAS_09_09__vs__C99.html

#include <novas.h>


cat_entry star;

object source;

observer loc;

novas_timespec time;

novas_frame frame;

sky_pos app;


// IERS Earth Orientation Parameters...

int leap_seconds = 37;

double dt1 = 0.06256; // [s]

double dx = 103.4;    // [mas]

double dy = 396.2;    // [mas]


// Define ICRS coordinates

make_cat_entry("Antares", "HIP", 80763,

  novas_hms_hours("16h 29m 24.45970s"),

  novas_dms_degrees("−26d 25m 55.2094s"),

  -12.11, -23.30, 5.89, -3.4, &star);


make_cat_object(&star, &source);


// Observer location

make_gps_observer(50.7374, 7.0982, 60.0,

  &loc);


// Set time of observation

novas_set_str_time(NOVAS_TAI,

  "2025-02-27T19:57:00.728+0200",

  leap_seconds, dut1, &time);


// Observer frame

novas_make_frame(NOVAS_FULL_ACCURACY,

  &loc, &time, dx, dy, &frame);


// apparent coordinates in system

novas_sky_pos(&source, &frame, NOVAS_CIRS, &app);

NOVAS_CIRS
@ NOVAS_CIRS
Celestial Intermediate Reference System: dynamical system of the true equator, with its origin at the...
Definition novas.h:871

NOVAS_FULL_ACCURACY
@ NOVAS_FULL_ACCURACY
Use full precision calculations to micro-arcsecond accuracy.
Definition novas.h:968

NOVAS_TAI
@ NOVAS_TAI
Innternational Atomic Time (TAI).
Definition novas.h:1778

novas.h
SuperNOVAS types, definitions, and function prototypes.

novas_set_str_time
int novas_set_str_time(enum novas_timescale timescale, const char *restrict str, int leap, double dut1, novas_timespec *restrict time)
Sets astronomical time in a specific timescale using a string specification.
Definition timescale.c:490

novas_hms_hours
double novas_hms_hours(const char *restrict hms)
Returns the decimal hours for a HMS string specification.
Definition parse.c:246

cat_entry
struct novas_cat_entry cat_entry
Basic astrometric data for any sidereal object located outside the solar system.

sky_pos
struct novas_sky_pos sky_pos
Celestial object's place on the sky; contains the output from place().

make_cat_entry
short make_cat_entry(const char *restrict name, const char *restrict catalog, long cat_num, double ra, double dec, double pm_ra, double pm_dec, double parallax, double rad_vel, cat_entry *source)
Fully populates the data structure for a catalog source, such as a star, with all parameters provided...
Definition target.c:331

make_gps_observer
int make_gps_observer(double latitude, double longitude, double height, observer *obs)
Initializes an observer data structure for a ground-based observer with the specified GPS / WGS84 loc...
Definition observer.c:277

make_cat_object
int make_cat_object(const cat_entry *star, object *source)
Populates and object data structure with the data for a catalog source.
Definition target.c:486

novas_sky_pos
int novas_sky_pos(const object *restrict object, const novas_frame *restrict frame, enum novas_reference_system sys, sky_pos *restrict out)
Calculates an apparent location on sky for the source.
Definition frames.c:838

novas_dms_degrees
double novas_dms_degrees(const char *restrict dms)
Returns the decimal degrees for a DMS string specification.
Definition parse.c:455

novas_make_frame
int novas_make_frame(enum novas_accuracy accuracy, const observer *obs, const novas_timespec *time, double xp, double yp, novas_frame *frame)
Sets up a observing frame for a specific observer location, time of observation, and accuracy require...
Definition frames.c:521

observer
struct novas_observer observer
Observer location.

novas_frame
A set of parameters that uniquely define the place and time of observation.
Definition novas.h:1898

novas_timespec
A structure, which defines a precise instant of time that can be extpressed in any of the astronomica...
Definition novas.h:1804