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Astronomical Applications Department, U.S. Naval Observatory - NOVASC (Page 7)

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Astronomical Applications Department, U.S. Naval Observatory - NOVASC
4. Important Functions in NOVAS-C
short int app_star (double tjd, short int earth, fk5_entry *star,
double *ra, double *dec)
Computes the apparent place of a star at date 'tjd', given its
mean place, proper motion, parallax, and radial velocity for
tjd (double)
TDT Julian date for apparent place.
earth (short int)
Body identification number for the Earth.
*star (struct fk5_entry)
Pointer to catalog entry structure (defined in novas.h).
*ra (double)
Apparent right ascension in hours, referred to true equator
and equinox of date 'tjd'.
*dec (double)
Apparent declination in degrees, referred to true equator
and equinox of date 'tjd'.
(short int)
0...Everything OK.
>0...Error code from function 'solarsystem'.
This function computes the apparent place of a star. The word "star" as used here refers to any object
outside the solar system. If the values of
, or
within structure
are unknown (or zero within the errors of measurement), the calling program should set them to
that the calling program must supply to
The input mean place at standard epoch J2000.0 is assumed to be the true mean place, similar to the
mean places in the FK5, and not contain the so-called "E-terms".
Efficiency is maximized when successive calls to app_star have the same value for
, since some
quantities which are functions only of time are thereby saved and reused.

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