kssun.h

/*
    SPDX-FileCopyrightText: 2002 Mark Hollomon <mhh@mindspring.com>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#pragma once
 
#include "ksplanet.h"
 
#include <QString>
 
/**
 * @class KSSun
 *
 * Child class of KSPlanetBase; encapsulates information about the Sun.
 *
 * @short Provides necessary information about the Sun.
 *
 * @author Mark Hollomon
 * @version 1.0
 */
class KSSun : public KSPlanet
{
  public:
    /**
     * Constructor.
     *
     * Defines constants needed by findPosition(). Sets Ecliptic coordinates appropriate for J2000.
     */
    KSSun();
 
    KSSun *clone() const override;
    SkyObject::UID getUID() const override;
 
    virtual ~KSSun() override = default;
 
    /**
     * Read orbital data from disk
     *
     * @note reimplemented from KSPlanet
     * @note we actually read Earth's orbital data.  The Sun's geocentric
     * ecliptic coordinates are by definition exactly the opposite of the
     * Earth's heliocentric ecliptic coordinates.
     */
    bool loadData() override;
 
    double nightFraction();
 
  protected:
    /**
     * Determine geocentric RA, Dec coordinates for the Epoch given in the argument.
     *
     * @p Epoch current Julian Date
     * @p Earth pointer to earth object
     */
    bool findGeocentricPosition(const KSNumbers *num, const KSPlanetBase *Earth = nullptr) override;
 
  private:
    void findMagnitude(const KSNumbers *) override;
};
 
long double equinox(int year, int d, int m, int angle);