/*

* moon.c

* arrenged by H.Tsujimura 1989,1990,1991,1995,1998,1999,2000,

* 2001,2002,2003

* Last updated: 20th December 2002

*

* This program is for computing the phase of the moon.

*

* History :

* $Log: tamo_moon.c $

* Revision 1.78 2007/02/14 09:10:47 tsujimura543

* 環境変数 TZ が未設定の場合にも対応

*

* Revision 1.77 2003/11/11 07:02:19 tsujimura543

* K&R 表記 → ANSI C 表記 に完全移行

*

* Revision 1.76 2003/10/30 08:13:54 tsujimura543

* Another HTML-lint で評価が100点になるように修正

*

* Revision 1.75 2003/05/26 07:47:50 tsujimura543

* インド国民暦(国家暦)対応、ネパール太陰暦修正

*

* Revision 1.74 2003/04/25 11:15:29 tsujimura543

* HTMLモード時の表示を若干変更

*

* Revision 1.73 2003/03/17 05:13:25 tsujimura543

* HTML出力内容を整理

*

* Revision 1.72 2003/03/12 10:05:31 tsujimura543

* 活動メモ対応準備 #2

*

* Revision 1.71 2003/03/11 12:11:43 tsujimura543

* 月齢計算の範囲を1年～9999年まで対応した(精度はともかくとして)

*

* Revision 1.70 2003/03/11 02:04:49 tsujimura543

* for Tsuporone's Activity memo

*

* Revision 1.69 2003/03/03 12:09:08 tsujimura543

* バグ修正 (参照している変数が間違っていた)

*

* Revision 1.68 2003/03/03 12:07:41 tsujimura543

* CGI にパラメータを渡せるようにした

*

* Revision 1.67 2003/02/24 09:25:42 tsujimura543

* 実行形式の拡張子が .cgi の場合、Content-type: 行を出力するようにした

*

* Revision 1.66 2003/02/07 08:08:35 tsujimura543

* 起動時オプションとして -H, -v を正式サポート

*

* Revision 1.65 2002/12/20 07:49:27 tsujimura543

* 輝度の表示を追加

*

* Revision 1.64 2002/12/20 06:43:32 tsujimura543

* 朔～次の朔 の表示が 1 lunation 前のものを表示してしまうことが

* ある不具合に対処

*

* Revision 1.63 2001/04/17 13:43:38 tsujimura543

* jdate() と jtime() の引数を変更 (2038年問題から解放)

*

* Revision 1.62 2001/02/22 13:31:23 tsujimura543

* 1970年1月1日以前、2038年1月19日以降の日時を指定するとmktime()で例外が発生

* する現象に対処

*

* Revision 1.61 2001/02/22 12:47:08 tsujimura543

* moon2.c を moon.c に統合。さらに、Web アプリケーションとして実運用してい

* た版と統合。

*

* Revision 1.60 2001/02/20 12:23:36 tsujimura543

* 他の派生バージョンと統合するため、いったん revision を固定

*

* Revision 1.54 2001/01/17 18:09:23 tsujimura543

* lunation の変わり目の直前になると月齢が負の値になってしまうことがある不具

* 合に対処

*

* Revision 1.53 2000/10/18 15:43:28 tsujimura543

* 月齢を表示したい年月日をコマンドラインで指定できるようにする

*

* Revision 1.52 1999/12/20 15:39:04 tsujimura543

* 実際の月齢より 約1.5 くらい大きな値になってしまう不具合に対処

*

* Revision 1.51 1999/03/29 15:53:10 tsujimura543

* moon.c の次期実験バージョン (moon2.c)

* 開発環境を Win32 に移す

* -- HTML 出力対応作業や動作確認は今後もUNIX (peach.na.rim.or.jp) 上で行なう

*

* Revision 1.1 1996/08/19 12:01:10 tsujimura

* Initial revision

* Withdrawal from `shizuka' (UNIX上での開発終了版)

*

*/

/*

A Moon for the Sun

Release 2.0

Designed and implemented by John Walker in December 1987,

revised and updated in February of 1988.

Make with:

cc -O moontool.c -o moontool -lm -lsuntool -lsunwindow -lpixrect

Adding appropriate floating point options to your hardware. This

program is a SunView tool which displays, as the icon for a closed

window, the current phase of the Moon. A subtitle in the icon gives

the age of the Moon in days and hours. If called with the "-t"

switch, it rapidly increments forward through time to display the

cycle of phases.

If you open the window, additional information is displayed regarding

the Moon. The information is generally accurate to within ten

minutes.

The algorithms used in this program to calculate the positions Sun and

Moon as seen from the Earth are given in the book "Practical Astronomy

With Your Calculator" by Peter Duffett-Smith, Second Edition,

Cambridge University Press, 1981. Ignore the word "Calculator" in the

title; this is an essential reference if you're interested in

developing software which calculates planetary positions, orbits,

eclipses, and the like. If you're interested in pursuing such

programming, you should also obtain:

"Astronomical Formulae for Calculators" by Jean Meeus, Third Edition,

Willmann-Bell, 1985. A must-have.

"Planetary Programs and Tables from -4000 to +2800" by Pierre

Bretagnon and Jean-Louis Simon, Willmann-Bell, 1986. If you want the

utmost (outside of JPL) accuracy for the planets, it's here.

"Celestial BASIC" by Eric Burgess, Revised Edition, Sybex, 1985. Very

cookbook oriented, and many of the algorithms are hard to dig out of

the turgid BASIC code, but you'll probably want it anyway.

Many of these references can be obtained from Willmann-Bell, P.O. Box

35025, Richmond, VA 23235, USA. Phone: (804) 320-7016. In addition

to their own publications, they stock most of the standard references

for mathematical and positional astronomy.

This program was written by:

John Walker

Autodesk, Inc.

2320 Marinship Way

Sausalito, CA 94965

(415) 332-2344 Ext. 829

Usenet: {sun!well}!acad!kelvin

This program is in the public domain: "Do what thou wilt shall be the

whole of the law". I'd appreciate receiving any bug fixes and/or

enhancements, which I'll incorporate in future versions of the

program. Please leave the original attribution information intact so

that credit and blame may be properly apportioned.

*/

/* Astronomical constants */

#define epoch 2444238.5 /* 1980 January 0.0 */

/* Constants defining the Sun's apparent orbit */

#define elonge 278.833540 /* Ecliptic longitude of the Sun

at epoch 1980.0 */

#define elongp 282.596403 /* Ecliptic longitude of the Sun at

perigee */

#define eccent 0.016718 /* Eccentricity of Earth's orbit */

#define sunsmax 1.495985e8 /* Semi-major axis of Earth's orbit, km */

#define sunangsiz 0.533128 /* Sun's angular size, degrees, at

semi-major axis distance */

/* Elements of the Moon's orbit, epoch 1980.0 */

#define mmlong 64.975464 /* Moon's mean lonigitude at the epoch */

#define mmlongp 349.383063 /* Mean longitude of the perigee at the

epoch */

#define mlnode 151.950429 /* Mean longitude of the node at the

epoch */

#define minc 5.145396 /* Inclination of the Moon's orbit */

#define mecc 0.054900 /* Eccentricity of the Moon's orbit */

#define mangsiz 0.5181 /* Moon's angular size at distance a

from Earth */

#define msmax 384401.0 /* Semi-major axis of Moon's orbit in km */

#define mparallax 0.9507 /* Parallax at distance a from Earth */

#define synmonth 29.53058868 /* Synodic month (new Moon to new Moon) */

#define lunatbase 2423436.0 /* Base date for E. W. Brown's numbered

series of lunations (1923 January 16) */

/* Properties of the Earth */

#define earthrad 6378.16 /* Radius of Earth in kilometres */

#ifdef WIN32

# include <windows.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <math.h>

#include <time.h>

#include "tamo.h"

#ifdef M_PI

# define PI M_PI

#else

# define PI 3.14159265358979323846 /* Assume not near black hole nor in

Tennessee */

#endif

/* Handy mathematical functions */

#define sgn(x) (((x) < 0) ? -1 : ((x) > 0 ? 1 : 0)) /* Extract sign */

#define abs(x) ((x) < 0 ? (-(x)) : (x)) /* Absolute val */

#define fixangle(a) ((a) - 360.0 * (floor((a) / 360.0))) /* Fix angle */

#define torad(d) ((d) * (PI / 180.0)) /* Deg->Rad */

#define todeg(d) ((d) * (180.0 / PI)) /* Rad->Deg */

#define dsin(x) (sin(torad((x)))) /* Sin from deg */

#define dcos(x) (cos(torad((x)))) /* Cos from deg */

#ifndef WIN32

# ifndef TRUE

# define TRUE 1

# define FALSE (!TRUE)

# endif

#endif

#if 0

static int testmode = FALSE; /* Rapid warp through time for debugging */

#endif

/* Forward functions */

static double jtime( long, long, long, long, long, long );

static double phase( double, double *, double *, double *,

double *, double *, double * );

static void phasehunt( double, double * );

static void jyear( double, long *, long *, long* );

static void jhms( double, long *, long *, long* );

/* JDATE -- Convert internal GMT date and time to Julian day

and fraction. */

static long

jdate( long yy, long mm, long dd )

{

long c, m, y;

y = yy;

m = mm;

if (m > 2)

m = m - 3;

else {

m = m + 9;

y--;

}

c = y / 100L; /* Compute century */

y -= 100L * c;

return dd + (c * 146097L) / 4 + (y * 1461L) / 4 +

(m * 153L + 2) / 5 + 1721119L;

}

/* JTIME -- Convert internal GMT date and time to astronomical Julian

time (i.e. Julian date plus day fraction, expressed as

a double). */

static double

jtime( long yy, long mm, long dd, long HH, long MM, long SS )

{

return (jdate(yy, mm, dd) - 0.5) +

(SS + 60 * (MM + 60 * HH)) / 86400.0;

}

/* JYEAR -- Convert Julian date to year, month, day, which are

returned via integer pointers to integers. */

static void

jyear( double td, long *yy, long *mm, long *dd )

{

double j, d, y, m;

td += 0.5; /* Astronomical to civil */

j = floor(td);

j = j - 1721119.0;

y = floor(((4 * j) - 1) / 146097.0);

j = (j * 4.0) - (1.0 + (146097.0 * y));

d = floor(j / 4.0);

j = floor(((4.0 * d) + 3.0) / 1461.0);

d = ((4.0 * d) + 3.0) - (1461.0 * j);

d = floor((d + 4.0) / 4.0);

m = floor(((5.0 * d) - 3) / 153.0);

d = (5.0 * d) - (3.0 + (153.0 * m));

d = floor((d + 5.0) / 5.0);

y = (100.0 * y) + j;

if (m < 10.0)

m = m + 3;

else {

m = m - 9;

y = y + 1;

}

*yy = (long)y;

*mm = (long)m;

*dd = (long)d;

}

/* JHMS -- Convert Julian time to hour, minutes, and seconds. */

static void

jhms( double j, long *h, long *m, long *s )

{

long ij;

j += 0.5; /* Astronomical to civil */

ij = (long)((j - floor(j)) * 86400.0);

*h = ij / 3600L;

*m = (ij / 60L) % 60L;

*s = ij % 60L;

}

/* MEANPHASE -- Calculates mean phase of the Moon for a given

base date and desired phase:

0.0 New Moon

0.25 First quarter

0.5 Full moon

0.75 Last quarter

Beware!!! This routine returns meaningless

results for any other phase arguments. Don't

attempt to generalise it without understanding

that the motion of the moon is far more complicated

that this calculation reveals. */

static double

meanphase( double sdate, double phase, double *usek, int *cnt )

{

long yy, mm, dd;

double k, t, t2, t3, nt1;

double preK;

static double preNt1 = 0.0;

jyear(sdate, &yy, &mm, &dd);

preK = k = (yy + ((mm - 1L) * (1.0 / 12.0)) - 1900.0) * 12.3685;

/* Time in Julian centuries from 1900 January 0.5 */

t = (sdate - 2415020.0) / 36525.64;

t2 = t * t; /* Square for frequent use */

t3 = t2 * t; /* Cube for frequent use */

*usek = k = floor(k) + phase;

nt1 = 2415020.75933 + synmonth * k

+ 0.0001178 * t2

- 0.000000155 * t3

+ 0.00033 * dsin(166.56 + 132.87 * t - 0.009173 * t2);

if ( *cnt >= 1 ) {

/* printf( "nt1 = %f, preNt1 = %f\n", nt1, preNt1 ); */

if ( nt1 - preNt1 > 45.0 ) {

*usek = k = floor(preK) - 1.0;

nt1 = 2415020.75933 + synmonth * k

+ 0.0001178 * t2

- 0.000000155 * t3

+ 0.00033 * dsin(166.56 + 132.87 * t - 0.009173 * t2);

}

}

(*cnt)++;

preNt1 = nt1;

return nt1;

}

/* TRUEPHASE -- Given a K value used to determine the

mean phase of the new moon, and a phase

selector (0.0, 0.25, 0.5, 0.75), obtain

the true, corrected phase time. */

static double

truephase( double k, double phase )

{

double t, t2, t3, pt, m, mprime, f;

int apcor = FALSE;

k += phase; /* Add phase to new moon time */

t = k / 1236.85; /* Time in Julian centuries from

1900 January 0.5 */

t2 = t * t; /* Square for frequent use */

t3 = t2 * t; /* Cube for frequent use */

pt = 2415020.75933 /* Mean time of phase */

+ synmonth * k

+ 0.0001178 * t2

- 0.000000155 * t3

+ 0.00033 * dsin(166.56 + 132.87 * t - 0.009173 * t2);

m = 359.2242 /* Sun's mean anomaly */

+ 29.10535608 * k

- 0.0000333 * t2

- 0.00000347 * t3;

mprime = 306.0253 /* Moon's mean anomaly */

+ 385.81691806 * k

+ 0.0107306 * t2

+ 0.00001236 * t3;

f = 21.2964 /* Moon's argument of latitude */

+ 390.67050646 * k

- 0.0016528 * t2

- 0.00000239 * t3;

if ((phase < 0.01) || (abs(phase - 0.5) < 0.01)) {

/* Corrections for New and Full Moon */

pt += (0.1734 - 0.000393 * t) * dsin(m)

+ 0.0021 * dsin(2 * m)

- 0.4068 * dsin(mprime)

+ 0.0161 * dsin(2 * mprime)

- 0.0004 * dsin(3 * mprime)

+ 0.0104 * dsin(2 * f)

- 0.0051 * dsin(m + mprime)

- 0.0074 * dsin(m - mprime)

+ 0.0004 * dsin(2 * f + m)

- 0.0004 * dsin(2 * f - m)

- 0.0006 * dsin(2 * f + mprime)

+ 0.0010 * dsin(2 * f - mprime)

+ 0.0005 * dsin(m + 2 * mprime);

apcor = TRUE;

}

else if ((abs(phase - 0.25) < 0.01 || (abs(phase - 0.75) < 0.01))) {

pt += (0.1721 - 0.0004 * t) * dsin(m)

+ 0.0021 * dsin(2 * m)

- 0.6280 * dsin(mprime)

+ 0.0089 * dsin(2 * mprime)

- 0.0004 * dsin(3 * mprime)

+ 0.0079 * dsin(2 * f)

- 0.0119 * dsin(m + mprime)

- 0.0047 * dsin(m - mprime)

+ 0.0003 * dsin(2 * f + m)

- 0.0004 * dsin(2 * f - m)

- 0.0006 * dsin(2 * f + mprime)

+ 0.0021 * dsin(2 * f - mprime)

+ 0.0003 * dsin(m + 2 * mprime)

+ 0.0004 * dsin(m - 2 * mprime)

- 0.0003 * dsin(2 * m + mprime);

if (phase < 0.5)

/* First quarter correction */

pt += 0.0028 - 0.0004 * dcos(m) + 0.0003 * dcos(mprime);

else

/* Last quarter correction */

pt += -0.0028 + 0.0004 * dcos(m) - 0.0003 * dcos(mprime);

apcor = TRUE;

}

if (!apcor) {

fprintf(stderr, "TRUEPHASE called with invalid phase selector.\n");

abort();

}

return pt;

}

/* PHASEHUNT -- Find time of phases of the moon which surround

the current date. Five phases are found, starting

and ending with the new moons which bound the

current lunation. */

static void

phasehunt( double sdate, double phases[5] )

{

double adate, k1, k2, nt1, nt2;

int cnt = 0;

adate = sdate - 45.0;

nt1 = meanphase(adate, 0.0, &k1, &cnt);

while (TRUE) {

adate += synmonth;

nt2 = meanphase(adate, 0.0, &k2, &cnt);

if ((nt1 <= sdate) && (nt2 > sdate))

break;

nt1 = nt2;

k1 = k2;

}

if (k2 - k1 >= 2.0)

k2 = k1 + 1.0;

phases[0] = truephase(k1, 0.0);

phases[1] = truephase(k1, 0.25);

phases[2] = truephase(k1, 0.5);

phases[3] = truephase(k1, 0.75);

phases[4] = truephase(k2, 0.0);

}

/* KEPLER -- Solve the equation of Kepler. */

static double

kepler( double m, double ecc )

{

double e, delta;

#define EPSILON 1E-6

e = m = torad(m);

do {

delta = e - ecc * sin(e) - m;

e -= delta / (1 - ecc * cos(e));

} while (abs(delta) > EPSILON);

return e;

}

/* PHASE -- Calculate phase of moon as a fraction:

The argument is the time for which the phase is requested,

expressed as a Julian date and fraction. Returns the terminator

phase angle as a percentage of a full circle (i.e., 0 to 1),

and stores into pointer arguments the illuminated fraction of

the Moon's disc, the Moon's age in days and fraction, the

distance of the Moon from the centre of the Earth, and the

angular diameter subtended by the Moon as seen by an observer

at the centre of the Earth.

*/

static double

phase( double pdate,

double *suangdia ) /* Sun's angular diameter */

{

double Day, N, M, Ec, Lambdasun, ml, MM, MN, Ev, Ae, A3, MmP,

mEc, A4, lP, V, lPP, NP, y, x, Lambdamoon,

MoonAge, MoonPhase,

MoonDist, MoonDFrac, MoonAng,

F, SunDist, SunAng;

/* Calculation of the Sun's position */

Day = pdate - epoch; /* Date within epoch */

N = fixangle((360.0 / 365.2422) * Day); /* Mean anomaly of the Sun */

M = fixangle(N + elonge - elongp); /* Convert from perigee

co-ordinates to epoch 1980.0 */

Ec = kepler(M, eccent); /* Solve equation of Kepler */

Ec = sqrt((1.0 + eccent) / (1.0 - eccent)) * tan(Ec / 2.0);

Ec = 2.0 * todeg(atan(Ec)); /* True anomaly */

Lambdasun = fixangle(Ec + elongp); /* Sun's geocentric ecliptic

longitude */

/* Orbital distance factor */

F = ((1.0 + eccent * cos(torad(Ec))) / (1.0 - eccent * eccent));

SunDist = sunsmax / F; /* Distance to Sun in km */

SunAng = F * sunangsiz; /* Sun's angular size in degrees */

/* Calculation of the Moon's position */

/* Moon's mean longitude */

ml = fixangle(13.1763966 * Day + mmlong);

/* Moon's mean anomaly */

MM = fixangle(ml - 0.1114041 * Day - mmlongp);

/* Moon's ascending node mean longitude */

MN = fixangle(mlnode - 0.0529539 * Day);

/* Evection */

Ev = 1.2739 * sin(torad(2.0 * (ml - Lambdasun) - MM));

/* Annual equation */

Ae = 0.1858 * sin(torad(M));

/* Correction term */

A3 = 0.37 * sin(torad(M));

/* Corrected anomaly */

MmP = MM + Ev - Ae - A3;

/* Correction for the equation of the centre */

mEc = 6.2886 * sin(torad(MmP));

/* Another correction term */

A4 = 0.214 * sin(torad(2.0 * MmP));

/* Corrected longitude */

lP = ml + Ev + mEc - Ae + A4;

/* Variation */

V = 0.6583 * sin(torad(2.0 * (lP - Lambdasun)));

/* True longitude */

lPP = lP + V;

/* Corrected longitude of the node */

NP = MN - 0.16 * sin(torad(M));

/* Y inclination coordinate */

y = sin(torad(lPP - NP)) * cos(torad(minc));

/* X inclination coordinate */

x = cos(torad(lPP - NP));

/* Ecliptic longitude */

Lambdamoon = todeg(atan2(y, x));

Lambdamoon += NP;

#if 0

/* Ecliptic latitude */

(void)todeg(asin(sin(torad(lPP - NP)) * sin(torad(minc))));

#endif

/* Calculation of the phase of the Moon */

/* Age of the Moon in degrees */

MoonAge = lPP - Lambdasun;

/* Phase of the Moon */

MoonPhase = (1.0 - cos(torad(MoonAge))) / 2.0;

/* Calculate distance of moon from the centre of the Earth */

MoonDist = (msmax * (1.0 - mecc * mecc)) /

(1.0 + mecc * cos(torad(MmP + mEc)));

/* Calculate Moon's angular diameter */

MoonDFrac = MoonDist / msmax;

MoonAng = mangsiz / MoonDFrac;

#if 0

/* Calculate Moon's parallax */

MoonPar = mparallax / MoonDFrac;

#endif

*pphase = MoonPhase;

*mage = synmonth * (fixangle(MoonAge) / 360.0);

*dist = MoonDist;

*angdia = MoonAng;

*sudist = SunDist;

*suangdia = SunAng;

return fixangle(MoonAge) / 360.0;

}

/*** qpom3() is arranged from qpom(). qpom() is written by Christopher Osburn.

/*

** qpom.c

** Christopher Osburn 911102

**

** Routines returning age of the moon (qpom), quantity of lunar face

** under illumination (illum), and the current lunation number

** (lunation) using the extremely cheesy epoch/iteration method.

**

*/

#define LPERIOD ((double)2551442.9) /* synodic period of the moon, seconds,

from astronomical almanac 1992 */

double

qpom3( double now, double epoch_near )

{

double diff, howfar;

diff = (double) now - epoch_near;

/* 本家の qpom() は epoch_near の部分に固定値を使用している

* ため、lunation の進行に伴って誤差がどんどん増えていくとい

* う欠点がある(実際に、qpom.c は数年毎に固定値部分を変更す

* る修正版が出ている)。

* qpom3() では、固定値ではなく、直近の epoch (朔のユリウス

* 日)を算出し、使用することで、長期にわたってプログラム変

* 更せずに済ませることができるものを目指している。

*/

howfar = diff / LPERIOD;

return LPERIOD * (howfar - (long) howfar) / 86400.0;

}

#ifdef UNIX

#ifdef SYSV

#define _tzname tzname

#define _timezone timezone

#else

char *_tzname[2];

long _timezone;

#endif

#endif

void

tamo_moon( long _yy, long _mm, long _dd, long _hh, long _mmm, long _ss,

int flag )

{

double jd, aom, cphase, cdist, cangdia, csund, csuang, lptime;

long yy, mm, dd, hh, mmm, ss; /* (直前の)朔の年月日時分秒 */

long uyy, umm, udd, uhh, ummm, uss; /* UTC変換後の現在日時 */

double phasar[5];

long lunation;

static double nptime = 0.0; /* Next new moon time */

double t1, t2;

int __y, __m, __d;

long tt;

struct tm *lm;

time_t t = 0;

/*

* timezone を求める (UTC とローカル時間の時差を求める)

*/

lm = localtime( &t );

#ifdef UNIX

# ifndef SYSV

/* BSD系のUNIXでは、以下の処理が必要

* (ANSI C 登場以前の UNIX では、BSD系でない場合でも、別途対応が必要

* であると思われる)

*/

if ( (lm->tm_isdst != 0) && (lm->tm_isdst != 1) ) {

lm->tm_isdst = 0;

lm->tm_gmtoff = 9 * 60 * 60;

lm->tm_zone = "JST";

}

_tzname[lm->tm_isdst] = lm->tm_zone;

_timezone = -(lm->tm_gmtoff);

# endif

#else /* !UNIX */

# ifdef WIN32

{

OSVERSIONINFO osverInfo;

BOOL ret;

osverInfo.dwOSVersionInfoSize = sizeof ( OSVERSIONINFO );

if ( ret = GetVersionEx( &osverInfo ) ) {

if ( (osverInfo.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) ||

(osverInfo.dwPlatformId == VER_PLATFORM_WIN32s ) ) {

/* Windows 3.x (Win32S環境), Windows95, Windows98 の場合は、

* 以下の処理が必要

*/

lm->tm_isdst = 0;

_tzname[lm->tm_isdst] = "JST";

_timezone = -(9 * 60 * 60);

}

}

}

# endif

#endif

/*

* ローカル時間で指定された年月日時分秒を UTC に変換する

*/

t1 = ((((double)absoluteFromGregorian( _dd, _mm, _yy ) * 24.0 +

(double)_hh) * 60.0) + (double)_mmm) * 60.0 +

(double)_ss + (double)_timezone;

tt = (_hh * 60 + _mmm) * 60 + _ss + _timezone;

uyy = _yy;

umm = _mm;

udd = _dd;

uhh = _hh;

ummm = _mmm;

uss = _ss;

if ( tt < 0 ) {

gregorianFromAbsolute( absoluteFromGregorian( _dd, _mm, _yy ) - 1,

&__d, &__m, &__y );

uyy = __y;

umm = __m;

udd = __d;

}

else if ( tt > 24 * 60 * 60 ) {

gregorianFromAbsolute( absoluteFromGregorian( _dd, _mm, _yy ) + 1,

&__d, &__m, &__y );

uyy = __y;

umm = __m;

udd = __d;

}

uhh = ((uhh * 60 * 60 + _timezone) / (60 * 60)) % 24;

if ( uhh < 0 )

uhh += 24;

ummm = ((ummm * 60 + _timezone) / 60) % 60;

if ( ummm < 0 )

ummm += 60;

uss = (uss + _timezone) % 60;

if ( uss < 0 )

uss += 60;

/*

* UTC をユリウス日に変換する

*/

jd = jtime( uyy, umm, udd, uhh, ummm, uss );

/*

* 当該ユリウス日の直前の朔の日時を求める

*/

yy = 0;

(void)phase( jd + 1, &cphase, &aom, &cdist, &cangdia, &csund, &csuang );

phasehunt( jd, phasar );

lptime = phasar[0];

lunation = (long)(floor(((lptime + 7.0) - lunatbase) / synmonth) + 1.0);

jyear( lptime, &yy, &mm, &dd );

jhms( lptime, &hh, &mmm, &ss );

/*

* 朔の日時(ユリウス日)を UTC に変換する

*/

t2 = ((((double)absoluteFromGregorian( dd, mm, yy ) * 24.0 +

(double)hh) * 60.0) + (double)mmm) * 60.0 + (double)ss;

/*

* 2つの UTC の差分を元に月齢を求める

*/

aom = qpom3( t1, t2 );

if ( aom < 0.0 )

aom += synmonth;

/*

* 結果を出力する

*/

if ( flag ) {

printf( "<TABLE BORDER=\"0\" SUMMARY=\"月齢\">\n<TR><TD>月齢" );

}

else {

if ( !strncmp( _tzname[lm->tm_isdst], "東京", 4 ) )

printf( "%d年%02d月%02d日 %02d時%02d分%02d秒(JST)現在の月齢",

_yy, _mm, _dd, _hh, _mmm, _ss );

else if ( _tzname[lm->tm_isdst][0] )

printf( "%d年%02d月%02d日 %02d時%02d分%02d秒(%s)現在の月齢",

_yy, _mm, _dd, _hh, _mmm, _ss, _tzname[lm->tm_isdst] );

else

printf( "%d年%02d月%02d日 %02d時%02d分%02d秒現在の月齢",

_yy, _mm, _dd, _hh, _mmm, _ss );

}

printf( "%s%.1f (%02d日%02d時%02d分)",

flag ? "</TD><TD>" : ":\n ",

aom /*+ 0.05*/,

(int) aom, ((int) (24 * (aom - floor(aom)))),

((int) (1440 * (aom - floor(aom)))) % 60 );

printf( " %s[輝度: %.1f%%]",

flag ? "<BR>" : " ",

(1.0 - cos((2.0 * PI * aom) / (LPERIOD / 86400.0))) / 2.0 * 100.0 );

if ( flag ) {

printf( "</TD>\n<TD ROWSPAN=5><IMG SRC=" );

printf(

#ifdef RIMNET

"\"/~tsupo/qpom/image/moon%2.2d.gif\"",

#else

"\"qpom/image/moon%2.2d.gif\"",

#endif

(int)(100.0 * (aom /*+ 0.05*/) / (LPERIOD / 86400.0)) );

printf( " WIDTH=\"110\" HEIGHT=\"110\"" );

printf( " ALIGN=\"LEFT\" BORDER=2 ALT=\"[%1d day old Moon]\">\n",

(long)(aom /*+ 0.05*/));

printf( "</TD></TR>\n<TR><TD>" );

}

else {

putchar( '\n' );

}

printf( "地球-月の距離%s%ldkm%s(地球赤道半径の%.1f倍)\n",

flag ? "</TD><TD>" : ": ",

(long) cdist,

flag ? "<BR>" : " ",

cdist / earthrad );

if ( flag )

printf( "</TD></TR>\n<TR><TD>" );

printf( "月の視差%s%.4f度\n",

flag ? "</TD><TD>" : ": ",

cangdia );

if ( flag )

printf( "</TD></TR>\n<TR><TD>" );

printf( "地球-太陽の距離%s%.0fkm%s(%.3f天文単位)\n",

flag ? "</TD><TD>" : ": ",

csund,

flag ? "<BR>" : " ",

csund / sunsmax );

if ( flag )

printf( "</TD></TR>\n<TR><TD>" );

printf( "太陽の視差%s%.4f度\n",

flag ? "</TD><TD>" : ": ",

csuang );

if ( flag )

printf( "</TD></TR>\n<TR><TD>" );

printf( "朔%s%ld年%02ld月%02ld日 %02ld時%02ld分 UTC ",

flag ? "</TD><TD COLSPAN=2>" : ": ",

yy, mm, dd, hh, mmm );

printf( "(Lunation %ld)\n", lunation );

if ( flag )

printf( "</TD></TR>\n<TR><TD>" );

lptime = phasar[1];

jyear( lptime, &yy, &mm, &dd );

jhms( lptime, &hh, &mmm, &ss );

printf( "上弦%s%ld年%02ld月%02ld日 %02ld時%02ld分 UTC\n",

flag ? "</TD><TD COLSPAN=2>" : ": ",

yy, mm, dd, hh, mmm );

if ( flag )

printf( "</TD></TR>\n<TR><TD>" );

lptime = phasar[2];

jyear( lptime, &yy, &mm, &dd );

jhms( lptime, &hh, &mmm, &ss );

printf( "望%s%ld年%02ld月%02ld日 %02ld時%02ld分 UTC\n",

flag ? "</TD><TD COLSPAN=2>" : ": ",

yy, mm, dd, hh, mmm );

if ( flag )

printf( "</TD></TR>\n<TR><TD>" );

lptime = phasar[3];

jyear( lptime, &yy, &mm, &dd );

jhms( lptime, &hh, &mmm, &ss );

printf( "下弦%s%ld年%02ld月%02ld日 %02ld時%02ld分 UTC\n",

flag ? "</TD><TD COLSPAN=2>" : ": ",

yy, mm, dd, hh, mmm );

if ( flag )

printf( "</TD></TR>\n<TR><TD>" );

nptime = phasar[4];

jyear( nptime, &yy, &mm, &dd );

jhms( nptime, &hh, &mmm, &ss );

printf( "次の朔%s%ld年%02ld月%02ld日 %02ld時%02ld分 UTC ",

flag ? "</TD><TD COLSPAN=2>" : ": ",

yy, mm, dd, hh, mmm );

printf( "(Lunation %ld)\n", lunation + 1 );

if ( flag )

printf( "</TD></TR>\n</TABLE>\n" );

#ifdef __TEST_20030507__

if ( !flag ) {

double target = 0.0;

lptime = phasar[0];

jyear( lptime, &yy, &mm, &dd );

jhms( lptime, &hh, &mmm, &ss );

printf( " 月齢 %f : %ld年%02ld月%02ld日 %02ld時%02ld分 UTC\n",

target, yy, mm, dd, hh, mmm );

target += 1.0;

do {

jyear( lptime, &yy, &mm, &dd );

jhms( lptime, &hh, &mmm, &ss );

/*

t1 = ((((double)absoluteFromGregorian( dd, mm, yy ) * 24.0 +

(double)hh) * 60.0) + (double)mmm) * 60.0 +

(double)ss;

// aom = qpom3( t1, t2 );

*/

jd = jtime( yy, mm, dd, hh, mmm, ss );

phase( jd + 1, &cphase, &aom, &cdist, &cangdia, &csund, &csuang );

/*

if ( aom < 0.0 )

aom += synmonth;

*/

// printf( "aom = %f\n", aom );

/*

jyear( lptime, &yy, &mm, &dd );

jhms( lptime, &hh, &mmm, &ss );

printf( " 月齢 %f : %ld年%02ld月%02ld日 %02ld時%02ld分 UTC\n",

aom, yy, mm, dd, hh, mmm );

*/

// if ( aom > 1.0 )

// break;

if ( floor(target * 100.0) == floor(aom * 100.00) ) {

printf( " 月齢 %f : %ld年%02ld月%02ld日 %02ld時%02ld分 UTC\n",

target - 1.0, yy, mm, dd, hh, mmm );

target += 1.0;

}

lptime += 1.0 / (24.0 * 3600.0);

/* lptime += 0.001; */

} while ( floor(aom * 100.00) != 0.0 );

lptime = phasar[4];

jyear( lptime, &yy, &mm, &dd );

jhms( lptime, &hh, &mmm, &ss );

printf( " 月齢 %f : %ld年%02ld月%02ld日 %02ld時%02ld分 UTC\n",

target, yy, mm, dd, hh, mmm );

}

#endif /* __TEST_20030507__ */

}

BOOL

isFullMoonDay( long _yy, long _mm, long _dd )

{

double jd, aom, cphase, cdist, cangdia, csund, csuang, lptime;

long yy, mm, dd, hh, mmm, ss; /* (直前の)朔の年月日時分秒 */

long uyy, umm, udd, uhh, ummm, uss; /* UTC変換後の現在日時 */

double phasar[5];

double t1;

int __y, __m, __d;

long tt;

struct tm *lm;

time_t t = 0;

/*

* timezone を求める (UTC とローカル時間の時差を求める)

*/

lm = localtime( &t );

#ifdef UNIX

# ifndef SYSV

/* BSD系のUNIXでは、以下の処理が必要

* (ANSI C 登場以前の UNIX では、BSD系でない場合でも、別途対応が必要

* であると思われる)

*/

if ( (lm->tm_isdst != 0) && (lm->tm_isdst != 1) ) {

lm->tm_isdst = 0;

lm->tm_gmtoff = 9 * 60 * 60;

lm->tm_zone = "JST";

}

_tzname[lm->tm_isdst] = lm->tm_zone;

_timezone = -(lm->tm_gmtoff);