libastro.h

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/*
    libastro
 
    functions used for coordinate conversions, based on libnova
 
    Copyright (C) 2020 Chris Rowland
    Copyright (C) 2021 Jasem Mutlaq
 
    This library is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published
    by the Free Software Foundation; either version 2.1 of the License, or
    (at your option) any later version.
 
    This library is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
    License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with this library; if not, write to the Free Software Foundation,
    Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 
*/
 
// file libsatro.h
 
// functions used for coordinate conversions, based on libnova
 
#pragma once
 
#include <libnova/utility.h>
#include "indimacros.h"
 
namespace INDI
{
 
 
typedef struct
{
    double rightascension;  
    double declination;     
} IEquatorialCoordinates;
 
typedef struct
{
    double azimuth;  
    double altitude; 
} IHorizontalCoordinates;
 
typedef struct
{
    double longitude; 
    double latitude;  
    double elevation; 
} IGeographicCoordinates;
 
/*
* \brief This provides astrometric helper functions
* based on the libnova library
*/
 
void ObservedToJ2000(IEquatorialCoordinates *observed, double jd, IEquatorialCoordinates *J2000pos);
 
void J2000toObserved(IEquatorialCoordinates *J2000pos, double jd, IEquatorialCoordinates * observed);
 
void EquatorialToHorizontal(IEquatorialCoordinates *object, IGeographicCoordinates *observer, double JD,
                            IHorizontalCoordinates *position);
 
void HorizontalToEquatorial(IHorizontalCoordinates *object, IGeographicCoordinates *observer, double JD,
                            IEquatorialCoordinates *position);
 
void ln_get_equ_nut(ln_equ_posn *posn, double jd, bool reverse = false);
 
}