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Astronomical Applications Department, U.S. Naval Observatory - NOVASC (Page 14)

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Astronomical Applications Department, U.S. Naval Observatory - NOVASC
LOCAL_PLANET



short int local_planet (double tjd, short int planet, short int earth,
double deltat, site_info *location,
double *ra, double *dec, double *dis)
PURPOSE:
Computes the local place of a planet or other solar system body,
given the location of the observer.
INPUT
ARGUMENTS:
tjd (double)
TDT Julian date for local place.
earth (short int)
Body identification number for the Earth.
planet (short int)
Body identification number for desired planet.
deltat (double)
Difference TDT-UT1 at 'tjd', in seconds.
*location (struct site_info)
Pointer to structure containing observer's location (defined
in novas.h).
OUTPUT
ARGUMENTS:
*ra (double)
Local right ascension in hours, referred to mean equator and
equinox of J2000.
*dec (double)
Local declination in degrees, referred to mean equator and
equinox of J2000.
*dis (double)
True distance from Earth to planet in AU.
RETURNED
VALUE:
(short int)
0...Everything OK.
>0...Error code from function 'solarsystem'.
input arguments and use. The local place is essentially the topocentric place expressed in the coordinate
system of standard epoch J2000.0.

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