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+/***************************************************************************
+ ksmoon.cpp - K Desktop Planetarium
+ -------------------
+ begin : Sun Aug 26 2001
+ copyright : (C) 2001 by Jason Harris
+ email : kstars@30doradus.org
+ ***************************************************************************/
+
+/***************************************************************************
+ * *
+ * This program is free software; you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License as published by *
+ * the Free Software Foundation; either version 2 of the License, or *
+ * (at your option) any later version. *
+ * *
+ ***************************************************************************/
+
+#include <stdlib.h>
+#include <math.h>
+
+#include <qfile.h>
+
+#include "ksnumbers.h"
+#include "ksutils.h"
+#include "kssun.h"
+#include "ksmoon.h"
+#include "kstarsdata.h"
+
+KSMoon::KSMoon(KStarsData *kd)
+ : KSPlanetBase( kd, I18N_NOOP("Moon"), "", 3474.8 /*diameter in km*/ ) {
+ BData.setAutoDelete(true);
+ LRData.setAutoDelete(true);
+}
+
+KSMoon::~KSMoon() {
+}
+
+bool KSMoon::data_loaded = false;
+QPtrList<KSMoon::MoonLRData> KSMoon::LRData;
+QPtrList<KSMoon::MoonBData> KSMoon::BData;
+
+bool KSMoon::loadData() {
+ if (data_loaded) return true;
+
+ QString line;
+ QFile f;
+ int nd, nm, nm1, nf;
+ double Li, Ri, Bi; //coefficients of the sums
+
+ if ( KSUtils::openDataFile( f, "moonLR.dat" ) ) {
+ QTextStream stream( &f );
+ while ( !stream.eof() ) {
+ line = stream.readLine();
+ QTextIStream instream( &line );
+ instream >> nd >> nm >> nm1 >> nf >> Li >> Ri;
+ LRData.append(new MoonLRData(nd, nm, nm1, nf, Li, Ri));
+ }
+ f.close();
+ } else
+ return false;
+
+
+ if ( KSUtils::openDataFile( f, "moonB.dat" ) ) {
+ QTextStream stream( &f );
+ while ( !stream.eof() ) {
+ line = stream.readLine();
+ QTextIStream instream( &line );
+ instream >> nd >> nm >> nm1 >> nf >> Bi;
+ BData.append(new MoonBData(nd, nm, nm1, nf, Bi));
+ }
+ f.close();
+ }
+
+ data_loaded = true;
+ return true;
+}
+
+bool KSMoon::findGeocentricPosition( const KSNumbers *num, const KSPlanetBase* ) {
+ //Algorithms in this subroutine are taken from Chapter 45 of "Astronomical Algorithms"
+ //by Jean Meeus (1991, Willmann-Bell, Inc. ISBN 0-943396-35-2. http://www.willbell.com/math/mc1.htm)
+ QString fname, snum, line;
+ QFile f;
+ double DegtoRad;
+ double T, L, D, M, M1, F, E, A1, A2, A3;
+ double sumL, sumR, sumB;
+
+ DegtoRad = acos( -1.0 )/180.0;
+
+ //Julian centuries since J2000
+ T = num->julianCenturies();
+
+ double Et = 1.0 - 0.002516*T - 0.0000074*T*T;
+
+ //Moon's mean longitude
+ L = 218.3164591 + 481267.88134236*T - 0.0013268*T*T + T*T*T/538841.0 - T*T*T*T/65194000.0;
+ while ( L > 360.0 ) L -= 360.0;
+ while ( L < 0.0 ) L += 360.0;
+ L *= DegtoRad;
+ //Moon's mean elongation
+ D = 297.8502042 + 445267.1115168*T - 0.0016300*T*T + T*T*T/545868.0 - T*T*T*T/113065000.0;
+ while ( D > 360.0 ) D -= 360.0;
+ while ( D < 0.0 ) D += 360.0;
+ D *= DegtoRad;
+ //Sun's mean anomaly
+ M = 357.5291092 + 35999.0502909*T - 0.0001536*T*T + T*T*T/24490000.0;
+ while ( M > 360.0 ) M -= 360.0;
+ while ( M < 0.0 ) M += 360.0;
+ M *= DegtoRad;
+ //Moon's mean anomaly
+ M1= 134.9634114 + 477198.8676313*T + 0.0089970*T*T + T*T*T/69699.0 - T*T*T*T/14712000.0;
+ while ( M1 > 360.0 ) M1 -= 360.0;
+ while ( M1 < 0.0 ) M1 += 360.0;
+ M1 *= DegtoRad;
+ //Moon's argument of latitude (angle from ascending node)
+ F = 93.2720993 + 483202.0175273*T - 0.0034029*T*T - T*T*T/3526000.0 + T*T*T*T/863310000.0;
+ while ( F > 360.0 ) F -= 360.0;
+ while ( F < 0.0 ) F += 360.0;
+ F *= DegtoRad;
+
+ A1 = 119.75 + 131.849*T;
+ A2 = 53.09 + 479264.290*T;
+ A3 = 313.45 + 481226.484*T;
+ while ( A1 > 360.0 ) A1 -= 360.0;
+ while ( A1 < 0.0 ) A1 += 360.0;
+ while ( A2 > 360.0 ) A2 -= 360.0;
+ while ( A2 < 0.0 ) A2 += 360.0;
+ while ( A3 > 360.0 ) A3 -= 360.0;
+ while ( A3 < 0.0 ) A3 += 360.0;
+ A1 *= DegtoRad;
+ A2 *= DegtoRad;
+ A3 *= DegtoRad;
+
+ //Calculate the series expansions stored in moonLR.txt and moonB.txt.
+ //
+ sumL = 0.0;
+ sumR = 0.0;
+
+ if (!loadData()) return false;
+
+ for (MoonLRData *mlrd = LRData.first(); mlrd != 0; mlrd = LRData.next()) {
+
+ E = 1.0;
+ if ( mlrd->nm ) { //if M != 0, include changing eccentricity of Earth's orbit
+ E = Et;
+ if ( abs( mlrd->nm )==2 ) E = E*E; //use E^2
+ }
+ sumL += E*mlrd->Li*sin( mlrd->nd*D + mlrd->nm*M + mlrd->nm1*M1 + mlrd->nf*F );
+ sumR += E*mlrd->Ri*cos( mlrd->nd*D + mlrd->nm*M + mlrd->nm1*M1 + mlrd->nf*F );
+ }
+
+ sumB = 0.0;
+ for (MoonBData *mbd = BData.first(); mbd != 0; mbd = BData.next()) {
+
+ E = 1.0;
+ if ( mbd->nm ) { //if M != 0, include changing eccentricity of Earth's orbit
+ E = Et;
+ if ( abs( mbd->nm )==2 ) E = E*E; //use E^2
+ }
+ sumB += E*mbd->Bi*sin( mbd->nd*D + mbd->nm*M + mbd->nm1*M1 + mbd->nf*F );
+ }
+
+ //Additive terms for sumL and sumB
+ sumL += ( 3958.0*sin( A1 ) + 1962.0*sin( L-F ) + 318.0*sin( A2 ) );
+ sumB += ( -2235.0*sin( L ) + 382.0*sin( A3 ) + 175.0*sin( A1-F ) + 175.0*sin( A1+F ) + 127.0*sin( L-M1 ) - 115.0*sin( L+M1 ) );
+
+ //Geocentric coordinates
+ setEcLong( ( L + DegtoRad*sumL/1000000.0 ) * 180./dms::PI ); //convert radians to degrees
+ setEcLat( ( DegtoRad*sumB/1000000.0 ) * 180./dms::PI );
+ Rearth = ( 385000.56 + sumR/1000.0 )/AU_KM; //distance from Earth, in AU
+ setAngularSize( asin(physicalSize()/Rearth/AU_KM)*60.*180./dms::PI ); //angular size in arcmin
+
+ EclipticToEquatorial( num->obliquity() );
+
+ //Determine position angle
+ findPA( num );
+
+ return true;
+}
+
+void KSMoon::findPhase( const KSSun *Sun ) {
+ Phase.setD( ecLong()->Degrees() - Sun->ecLong()->Degrees() );
+ Phase.setD( Phase.reduce().Degrees() );
+ int iPhase = int( 0.1*Phase.Degrees()+0.5 );
+ if (iPhase==36) iPhase = 0;
+ QString sPhase;
+ sPhase = sPhase.sprintf( "%02d", iPhase );
+ QString imName = "moon" + sPhase + ".png";
+
+ QFile imFile;
+ if ( KSUtils::openDataFile( imFile, imName ) ) {
+ imFile.close();
+ image0()->load( imFile.name() );
+ image()->load( imFile.name() );
+
+ }
+}
+
+QString KSMoon::phaseName() const {
+ double f = illum();
+ double p = phase().Degrees();
+
+ //First, handle the major phases
+ if ( f > 0.99 ) return i18n( "moon phase, 100 percent illuminated", "Full moon" );
+ if ( f < 0.01 ) return i18n( "moon phase, 0 percent illuminated", "New moon" );
+ if ( fabs( f - 0.50 ) < 0.01 ) {
+ if ( p < 180.0 ) return i18n( "moon phase, half-illuminated and growing", "First quarter" );
+ else return i18n( "moon phase, half-illuminated and shrinking", "Third quarter" );
+ }
+
+ //Next, handle the more general cases
+ if ( p < 90.0 ) return i18n( "moon phase between new moon and 1st quarter", "Waxing crescent" );
+ else if ( p < 180.0 ) return i18n( "moon phase between 1st quarter and full moon", "Waxing gibbous" );
+ else if ( p < 270.0 ) return i18n( "moon phase between full moon and 3rd quarter", "Waning gibbous" );
+ else if ( p < 360.0 ) return i18n( "moon phase between 3rd quarter and new moon", "Waning crescent" );
+
+ else return i18n( "unknown" );
+}
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