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235 lines
8.2 KiB
C++
235 lines
8.2 KiB
C++
/*
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This file is part of the kholidays library.
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Copyright (c) 2004,2007,2009 Allen Winter <winter@kde.org>
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Copyright (c) 1989, 1993 //krazy:exclude=copyright
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The Regents of the University of California. All rights reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "lunarphase.h"
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#include <config-kholidays.h>
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#include <KDebug>
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#include <KGlobal>
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#include <KLocalizedString>
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#include <QtCore/QDateTime>
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using namespace KHolidays;
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static double percentFull( uint tmpt );
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static double degreesToRadians( double degree );
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static void adj360( double *degree );
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QString LunarPhase::phaseNameAtDate( const QDate &date )
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{
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return phaseName( phaseAtDate( date ) );
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}
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QString LunarPhase::phaseName( LunarPhase::Phase phase )
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{
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switch ( phase ) {
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case NewMoon:
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return( i18n( "New Moon" ) );
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case FullMoon:
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return( i18n( "Full Moon" ) );
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case FirstQuarter:
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return( i18n( "First Quarter Moon" ) );
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case LastQuarter:
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return( i18n( "Last Quarter Moon" ) );
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default:
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case None:
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return QString();
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}
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}
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LunarPhase::Phase LunarPhase::phaseAtDate( const QDate &date )
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{
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Phase retPhase = None;
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// compute percent-full for the middle of today and yesterday.
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const QTime anytime( 12, 0, 0 );
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const QDateTime today( date, anytime, Qt::UTC );
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const double todayPer = percentFull( today.toTime_t() ) + 0.5;
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const QDateTime tomorrow( date.addDays( 1 ), anytime, Qt::UTC );
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const double tomorrowPer = percentFull( tomorrow.toTime_t() ) + 0.5;
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if ( static_cast<int>( todayPer ) == 100 &&
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static_cast<int>( tomorrowPer ) != 100 ) {
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retPhase = FullMoon;
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} else if ( static_cast<int>( todayPer ) == 0 &&
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static_cast<int>( tomorrowPer ) != 0 ) {
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retPhase = NewMoon;
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} else {
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if ( todayPer > 50 && tomorrowPer < 50 ) {
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retPhase = LastQuarter;
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}
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if ( todayPer < 50 && tomorrowPer > 50 ) {
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retPhase = FirstQuarter;
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}
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// Note: if you want to support crescent and gibbous phases then please
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// read the source for the original BSD 'pom' program.
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}
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return( retPhase );
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}
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software posted to USENET.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_SYS_CDEFS_H
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#include <sys/cdefs.h>
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#endif
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/*
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* Phase of the Moon. Calculates the current phase of the moon.
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* Based on routines from `Practical Astronomy with Your Calculator',
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* by Duffett-Smith. Comments give the section from the book that
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* particular piece of code was adapted from.
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*
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* -- Keith E. Brandt VIII 1984
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*
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* Updated to the Third Edition of Duffett-Smith's book, Paul Janzen, IX 1998
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*
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*/
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#include <ctype.h>
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#ifdef HAVE_ERR_H
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#include <err.h>
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#endif
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#include <math.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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static double PI = 3.14159265358979323846;
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/*
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* The EPOCH in the third edition of the book is 1990 Jan 0.0 TDT.
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* In this program, we do not bother to correct for the differences
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* between UTC (as shown by the UNIX clock) and TDT. (TDT = TAI + 32.184s;
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* TAI-UTC = 32s in Jan 1999.)
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*/
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static int EPOCH_MINUS_1970 = ( 20 * 365 + 5 - 1 ); /* 20 years, 5 leaps, back 1 day to Jan 0 */
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static double EPSILONg = 279.403303; /* solar ecliptic long at EPOCH */
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static double RHOg = 282.768422; /* solar ecliptic long of perigee at EPOCH */
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static double ECCEN = 0.016713; /* solar orbit eccentricity */
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static double lzero = 318.351648; /* lunar mean long at EPOCH */
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static double Pzero = 36.340410; /* lunar mean long of perigee at EPOCH */
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static double Nzero = 318.510107; /* lunar mean long of node at EPOCH */
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/*
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* percentFull --
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* return phase of the moon as a percentage of full
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*/
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static double percentFull( uint tmpt )
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{
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double N, Msol, Ec, LambdaSol, l, Mm, Ev, Ac, A3, Mmprime;
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double A4, lprime, V, ldprime, D, Nm;
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double days;
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days = ( tmpt - EPOCH_MINUS_1970 * 86400 ) / 86400.0;
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N = 360 * days / 365.242191; /* sec 46 #3 */
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adj360( &N );
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Msol = N + EPSILONg - RHOg; /* sec 46 #4 */
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adj360( &Msol );
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Ec = 360 / PI * ECCEN * sin( degreesToRadians( Msol ) ); /* sec 46 #5 */
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LambdaSol = N + Ec + EPSILONg; /* sec 46 #6 */
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adj360( &LambdaSol );
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l = 13.1763966 * days + lzero; /* sec 65 #4 */
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adj360( &l );
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Mm = l - ( 0.1114041 * days ) - Pzero; /* sec 65 #5 */
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adj360( &Mm );
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Nm = Nzero - ( 0.0529539 * days ); /* sec 65 #6 */
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adj360( &Nm );
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Ev = 1.2739 * sin( degreesToRadians( 2 * ( l - LambdaSol ) - Mm ) ); /* sec 65 #7 */
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Ac = 0.1858 * sin( degreesToRadians( Msol ) ); /* sec 65 #8 */
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A3 = 0.37 * sin( degreesToRadians( Msol ) );
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Mmprime = Mm + Ev - Ac - A3; /* sec 65 #9 */
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Ec = 6.2886 * sin( degreesToRadians( Mmprime ) ); /* sec 65 #10 */
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A4 = 0.214 * sin( degreesToRadians( 2 * Mmprime ) ); /* sec 65 #11 */
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lprime = l + Ev + Ec - Ac + A4; /* sec 65 #12 */
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V = 0.6583 * sin( degreesToRadians( 2 * ( lprime - LambdaSol ) ) );/* sec 65 #13 */
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ldprime = lprime + V; /* sec 65 #14 */
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D = ldprime - LambdaSol; /* sec 67 #2 */
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D = 50.0 * ( 1 - cos( degreesToRadians( D ) ) ); /* sec 67 #3 */
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return D;
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}
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/*
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* degreesToRadians --
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* convert degrees to radians
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*/
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static double degreesToRadians( double degree )
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{
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return ( degree * PI ) / 180.00;
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}
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/*
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* adj360 --
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* adjust value so 0 <= degree <= 360
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*/
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static void adj360( double *degree )
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{
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for ( ;; ) {
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if ( *degree < 0 ) {
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*degree += 360;
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} else if ( *degree > 360 ) {
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*degree -= 360;
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} else {
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break;
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}
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}
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}
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