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<?php
##
## this file name is 'class.solar.php'
##
## solar object -- get sun position or 24 solar terms
##
## [author]
## - Chilbong Kim, <san2(at)linuxchannel.net>
## - http://linuxchannel.net/
##
## [changes]
## - 2011.11.06 : some
## - 2011.09.30 : tune of sunrise_sunset()
## - 2011.09.19 : tune of time2stime()
## - 2010.10.15 : bug fixed of _constellation()
## - 2010.07.29 : add sambok()
## - 2009.06.08 : extended, date() to calendar::_date() of class.calendar.php
## - 2005.04.17 : add sunrise_sunset()
## - 2005.02.06 : rebuid deg2valid(), add zodiac()
## - 2005.01.24 : rebuild time2stime(), atan2()
## - 2005.01.18 : bug fixed:$RA
## - 2003.09.08 : bug fixed
## - 2003.09.06 : new build
##
## [근사식에 대한 신뢰]
## - 표준편차 : 1289.7736 = 21.5 minutes (standard deviation)
## - 평균오차 : 817.57409541246 = 13.6 minutes
## - 최대오차 : +4102.7340(68.4 minutes), -4347.2395(72.5 minutes)
##
## [근사식으로 계산한 24절기 실제 오차] 1902 ~ 2037 년
## - 표준편차 : 1122.1921 = 18.7 분
## - 평균오차 : +686.08382175161 = +11.4 분
## - 최대오차 : +4297.252300024 = +71.6 분, -4278.048699975 = -71.3 분
## - 최소오차 : +0.16999998688698 = 0 초
##
## [근사식 + 년도 보정으로 계산한 24절기 실제 오차] 1902 ~ 2037 년
## - 표준편차 : 450.8534 = 7.5 분
## - 평균오차 : +305.38638890903 = 5.0 분
## - 최대오차 : +3028.2343000174 = +50.5 분, -1982.9391000271 = -33.1 분
## - 최소오차 : +0.0085000991821289 = 0 초
##
## [valid date]
## - 1902.01.01 00:00:00 <= utime <= 2037.12.31 23:59:59
##
## [support date]
## - unix timestamp base: 1902-01-01 00:00:00 <= date <= 2037-12-31 23:59:59 (guess)
## - JD(Julian Day) base: BC 4713-01-01 12:00 GMT <= Gregorian date <= AD 9999 (guess)
##
## [download & online source view]
## - http://ftp.linuxchannel.net/devel/php_solar/
## - http://ftp.linuxchannel.net/devel/php_calendar/
##
## [demo]
## - http://linuxchannel.net/gaggle/solar.php
##
## [docs]
## - http://linuxchannel.net/docs/solar-24terms.txt
##
## [references]
## - http://cgi.chollian.net/~kohyc/
## - http://user.chollian.net/~kimdbin/
## - http://user.chollian.net/~kimdbin/re/calendar.html
## - http://user.chollian.net/~kimdbin/re/suncoord.html
## - http://user.chollian.net/~kimdbin/qna/al138.html
## - http://ruby.kisti.re.kr/~manse/contents-3.html
## - http://ruby.kisti.re.kr/~anastro/sub_index.htm
## - http://www-ph.postech.ac.kr/~obs/lecture/lec1/elementary/nakedeyb.htm
## - http://ruby.kisti.re.kr/~anastro/calendar/etime/ETime.html
## - http://www.sundu.co.kr/5-information/5-3/5f3-3-5-04earth-1.htm
## - http://www-ph.postech.ac.kr/~obs/lecture/lec1/elementary/nakedeya.htm
## - http://upgradename.com/calm.php
## - http://aa.usno.navy.mil/faq/docs/SunApprox.html
## - http://aa.usno.navy.mil/data/docs/JulianDate.html
## - http://williams.best.vwh.net/sunrise_sunset_example.htm // sunrise sunset
## - http://www.stargazing.net/kepler/sunrise.html // sunrise sunset
## - http://eclipse.gsfc.nasa.gov/SEhelp/deltatpoly2004.html // delta T
## - http://eclipse.gsfc.nasa.gov/SEhelp/deltat2004.html // delta T
## - http://star-www.st-and.ac.uk/~fv/webnotes/index.html // Positional Astronomy
##
## [usage]
##
## [example]
## require_once 'class.calendar.php';
## require_once 'class.solar.php';
## $sun = array();
## $terms = solar::terms(date('Y'),1,12,&$sun);
## print_r($terms);
## print_r($sun);
## print_r(solar::sun(time()));
##
class solar
{
## check solar terms in today or tomorrow
##
function &solar($utime=0, $GMT=FALSE)
{
return solar::today($utime,$GMT);
}
function &today($utime=0, $GMT=FALSE)
{
if($utime == '') $utime = time();
if($GMT) $utime -= 32400;
list($year,$moon,$moonday) = explode(' ',date('Y n nd',$utime));
$tomorrow = date('nd',$utime+86400);
$terms = solar::terms($year,$moon,0);
$samboks = solar::sambok($year);
$sambok1 = $samboks[$moonday];
$sambok2 = $samboks[$tomorrow];
if($term = $terms[$moonday])
{
if($sambok1) $term .= '/'.$sambok1;
$str = '오늘은 <B>'.$term.'</B>입니다.';
}
else if($term = $terms[$tomorrow])
{
if($sambok2) $term .= '/'.$sambok2;
$str = '내일은 <B>'.$term.'</B>입니다.';
}
else if($sambok1) $str = '오늘은 <B>'.$sambok1.'</B>입니다.';
else if($sambok2) $str = '내일은 <B>'.$sambok2.'</B>입니다.';
return $str;
}
## get sun position at unix timestamp
##
## [limit]
## - mktime(0,0,0,1,1,1902) < $utime < mktime(23,59,59,12,31,2037)
##
## [study]
## - w = 23.436
## - tan RA = (sin L * cos w - tan e * sin w ) / cos L
## - sin d = (sin e * cos w) + (cos e * sin w * sin L)
##
## [example]
## - print_r(solar::sun(mktime( 10,0,0,3,21,2003) ));
## - print_r(solar::sun(mktime(10-9,0,0,3,21,2003),1)); // same as
##
function &sun($utime, $GMT=FALSE)
{
$L = $D = $JD = 0; $J = '';
$deg2rad = array();
/***
if($utime<-2145947400 || $utime>2145884399)
{
echo "\nerror: invalid input $utime, 1902.01.01 00:00:00 <= utime <= 2037.12.31 23:59:59\n";
return -1;
}
***/
list($L,$atime) = solar::sunl($utime,$GMT,&$D,&$JD,&$J,&$deg2rad);
## Sun's ecliptic, in degress
##
$e = sprintf('%.10f',23.439 - (0.00000036*$D)); // degress
$cosg = cos($deg2rad['g']); // degress
$cos2g = cos($deg2rad['2g']); // degress
## R == AU (sun ~ earth)
## The distance of the Sun from the Earth, R, in astronomical units (AU)
##
$R = sprintf('%.10f',1.00014 - (0.01671*$cosg) - (0.00014*$cos2g));
## convert
##
$deg2rad['e'] = deg2rad($e); // radian
$deg2rad['L'] = deg2rad($L); // radian
$cose = cos($deg2rad['e']); // degress
$sinL = sin($deg2rad['L']); // degress
$cosL = cos($deg2rad['L']); // degress
$sine = sin($deg2rad['e']); // degress
## the Sun's right ascension(RA)
##
//$tanRA = sprintf('%.10f',$cose * $sinL / $cosL); // degress
//$RA = sprintf('%.10f',rad2deg(atan($tanRA)));
//$RA = $cosL<0 ? $RA+180 : ($sinL<0 ? $RA+360 : $RA); // patch 2005.01.18
$RA = sprintf('%.10f',rad2deg(atan2($cose*$sinL,$cosL)));
$RA = solar::deg2valid($RA);
## the Sun's declination(d)
##
$sind = sprintf('%.10f',$sine * $sinL); // degress
$d = sprintf('%.10f',rad2deg(asin($sind))); // Sun's declination, degress
$solartime = solar::deg2solartime($L);
$daytime = solar::deg2daytime($RA);
//if(!($L1=round($L) % 15))
//{
// $idx = $L1 / 15;
// list($hterms) = solar::gterms();
//}
## all base degress or decimal
##
return array
(
'JD' => $JD, /*** Julian Day ***/
'J' => 'J'.$J, // Jxxxx.xxxx format
'L' => $L, /*** Sun's geocentric apparent ecliptic longitude ***/
'e' => $e, /*** Sun's ecliptic ***/
'R' => $R, /*** Sun from the Earth, astronomical units (AU) ***/
'RA' => $RA, /*** Sun's right ascension ***/
'd' => $d, /*** Sun's declination ***/
'stime' => $solartime, /*** solar time ***/
'dtime' => $daytime, /*** day time ***/
'atime' => $atime, /*** append time for integer degress **/
'utime' => $utime, /*** unix timestamp ***/
'date' => calendar::_date('D, d M Y H:i:s T',$utime), /*** KST date ***/
'gmdate' => calendar::_date('D, d M Y H:i:s ',$utime-date('Z')).'GMT', /*** GMT date ***/
'_L' => solar::deg2angle($L),
'_e' => solar::deg2angle($e,1),
'_RA' => solar::deg2angle($RA),
'_d' => solar::deg2angle($d,1),
'_stime' => solar::time2stime($solartime,FALSE,TRUE),
'_dtime' => solar::time2stime($daytime),
'_atime' => solar::time2stime($atime,TRUE),
);
}
function &sunl($utime, $GMT=FALSE, $D=0, $JD=0, $J='', $deg2rad=array())
{
if($GMT) $utime += 32400; // force GMT to static KST, see 946727936
## D -- get the number of days from base JD
## D = JD(Julian Day) - 2451545.0, base JD(J2000.0)
##
## base position (J2000.0), 2000-01-01 12:00:00, UT
## as mktime(12,0,0-64,1,1,2000) == 946695536 unix timestamp at KST
## as gmmktime(12,0,0-64,1,1,2000) == 946727936 unix timestamp at GMT
##
$D = $utime - 946727936; // number of time
$D = sprintf('%.10f',$D/86400); // float, number of days
$JD = sprintf('%.10f',$D+2451545.0); // float, Julian Day
$J = sprintf('%.4f',2000.0 + ($JD-2451545.0)/365.25); // Jxxxx.xxxx format
$g = sprintf('%.10f',357.529 + (0.98560028 * $D));
$q = sprintf('%.10f',280.459 + (0.98564736 * $D));
## fixed
##
$g = solar::deg2valid($g); // to valid degress
$q = solar::deg2valid($q); // to valid degress
## convert
##
$deg2rad = array();
$deg2rad['g'] = deg2rad($g); // radian
$deg2rad['2g'] = deg2rad($g*2); // radian
$sing = sin($deg2rad['g']); // degress
$sin2g = sin($deg2rad['2g']); // degress
## L is an approximation to the Sun's geocentric apparent ecliptic longitude
##
$L = sprintf('%.10f',$q + (1.915 * $sing) + (0.020*$sin2g));
$L = solar::deg2valid($L); // degress
$atime = solar::deg2solartime(round($L)-$L); // float
return array($L,$atime); // array, float degress, float seconds
}
/***
function &_atime($utime)
{
static $unit = 87658.1256;
list($L) = solar::sunl($utime);
$td = round($L) - $L;
while(abs($td) > 0.0000114) // 1/$unit
{
$utime += $unit * $td;
list($L) = solar::sunl($utime);
$td = round($L) - $L;
}
return $utime;
}
***/
/***
function &sinl($f, $v)
{
return sin(deg2rad($f+$v));
}
## http://linux-sarang.net/board/?p=read&table=qa&no=198189
## -2 < sin x < + 2
## sin (77 + L) ==> (77 + L - 1.915 sin (77 + L))
##
function &l2d($L)
{
$L = (int)$L; // 0 <= $L <= 345
//$sinl = sin(deg2rad(77+$L));
$sinl = solar::sinl($L,77);
//$sinl = solar::sinl($L-(1.915)*$sinl,77);
//$sin2l = sin(deg2rad(154+($L*2)));
$sin2l = solar::sinl($L*2,154);
$sin2l = solar::sinl($L-(0.020*$L*2*$sin2l),154);
$sin2l = solar::sinl($L-(0.020*$L*2*$sin2l),154);
$D = sprintf('%.10f',($L - 280.459 - (1.915 * $sinl) - (0.020 * $sin2l)) / 0.98564736);
return $D; // float
}
function &l2jd($L)
{
$D = solar::l2d($L);
$JD = sprintf('%.10f',$D+2451545.0);
//$JD = $JD + ($i * 360 / 0.98564736)
return $JD; // float
}
function &l2utime($year, $L, $GMT=FLASE)
{
$i = (int)$year - 2000 + 1;
$D = solar::l2d($L);
$utime = ($D * 86400) + 946727936 + (31556925.216 * $i);
$utime = round($utime);
return $utime - ($GMT ? 32400 : 0); // integer
}
***/
## 1 hour == 15 degress
## 1 degress == 4 minute == 240 seconds
##
function °2daytime($deg)
{
return sprintf('%.4f',$deg*240); // seconds
}
## 1 solar year == 365.242190 days == 31556925.216 seconds
## 1 degress == 31556925.216 seconds / 360 degress == 87658.1256 seconds
##
function °2solartime($deg)
{
return sprintf('%.4f',$deg*87658.1256); // seconds
}
function °2angle($deg, $singed=FALSE)
{
list($d,$m,$s) = calendar::deg2dms($deg,$signed);
return $d.chr(161).chr(198).$m.chr(161).chr(199).$s.chr(161).chr(200);
}
function °2valid($deg)
{
//if($deg <= 360 && $deg >=0) return $deg;
$deg = ($deg>=0) ? fmod($deg,360) : fmod($deg,360)+360.0;
return (float)$deg; // float degress
}
function &moon2valid($moon)
{
//$moon = max($moon,1);
//$moon = min($moon,12);
if($moon < 1) $moon = 1;
else if($moon > 12) $moon = 12;
return (int)$moon;
}
function &time2stime($time, $singed=FALSE, $printday=FALSE)
{
if($singed) $singed = '+';
if($time<0) { $singed = '-'; $time = abs($time); }
$printday = $printday ? 'z ' : ''; // why? 0 is false
return $singed.date($printday.'H i s',$time-date('Z')); // $time is small, _date() to date()
}
function >erms()
{
static $hterms = array
(
'소한','대한','입춘','우수','경칩','춘분','청명','곡우',
'입하','소만','망종','하지','소서','대서','입추','처서',
'백로','추분','한로','상강','입동','소설','대설','동지'
);
static $tterms = array
(
-6418939, -5146737, -3871136, -2589569, -1299777, 0,
1310827, 2633103, 3966413, 5309605, 6660762, 8017383,
9376511, 10735018, 12089855, 13438199, 14777792, 16107008,
17424841, 18731368, 20027093, 21313452, 22592403, 23866369
);
## mktime(7+9,36,19-64,3,20,2000), 2000-03-20 16:35:15(KST)
##
if(!defined('__SOLAR_START__'))
{
define('__SOLAR_START__',953537715); // start base unix timestamp
define('__SOLAR_TYEAR__',31556940); // tropicalyear to seconds
define('__SOLAR_BYEAR__',2000); // start base year
}
return array($hterms,$tterms);
}
function &tterms($year)
{
static $addstime = array
(
1902=> 1545, 1903=> 1734, 1904=> 1740, 1906=> 475, 1907=> 432,
1908=> 480, 1909=> 462, 1915=> -370, 1916=> -332, 1918=> -335,
1919=> -263, 1925=> 340, 1927=> 344, 1928=> 2133, 1929=> 2112,
1930=> 2100, 1931=> 1858, 1936=> -400, 1937=> -400, 1938=> -342,
1939=> -300, 1944=> 365, 1945=> 380, 1946=> 400, 1947=> 200,
1948=> 244, 1953=> -266, 1954=> 2600, 1955=> 3168, 1956=> 3218,
1957=> 3366, 1958=> 3300, 1959=> 3483, 1960=> 2386, 1961=> 3015,
1962=> 2090, 1963=> 2090, 1964=> 2264, 1965=> 2370, 1966=> 2185,
1967=> 2144, 1968=> 1526, 1971=> -393, 1972=> -430, 1973=> -445,
1974=> -543, 1975=> -393, 1980=> 300, 1981=> 490, 1982=> 400,
1983=> 445, 1984=> 393, 1987=>-1530, 1988=>-1600, 1990=> -362,
1991=> -366, 1992=> -400, 1993=> -449, 1994=> -321, 1995=> -344,
1999=> 356, 2000=> 480, 2001=> 483, 2002=> 504, 2003=> 294,
2007=> -206, 2008=> -314, 2009=> -466, 2010=> -416, 2011=> -457,
2012=> -313, 2018=> 347, 2020=> 257, 2021=> 351, 2022=> 159,
2023=> 177, 2026=> -134, 2027=> -340, 2028=> -382, 2029=> -320,
2030=> -470, 2031=> -370, 2032=> -373, 2036=> 349, 2037=> 523,
);
static $addttime = array
(
1919=> array(14=>-160), 1939=> array(10=> -508),
1953=> array( 0=> 220), 1954=> array( 1=>-2973),
1982=> array(18=> 241), 1988=> array(13=>-2455),
2013=> array( 6=> 356), 2031=> array(20=> 411),
2023=> array( 0=> 399, 11=>-571),
);
return array($addstime[$year],$addttime[$year]);
}
## get the 24 solar terms, 1902 ~ 2037
##
## [usage]
## - array solar::terms(int year [, int smoon [, int length [, array &sun]]] )
##
function &terms($year=0, $smoon=1, $length=12, $sun=array())
{
$year = (int)$year;
$sun = array();
$smoon = (int)$smoon;
$length = (int)$length;
$times = array();
if(!$year) $year = date('Y');
/***
if($year<1902 || $year>2037)
{
echo "\nerror: invalid input $year, 1902 <= year <= 2037\n";
return -1;
}
***/
list($hterms,$tterms) = solar::gterms();
list($addstime,$addttime) = solar::tterms($year);
## mktime(7+9,36,19-64,3,20,2000), 2000-03-20 16:35:15(KST)
##
$start = __SOLAR_START__; // start base unix timestamp
$tyear = __SOLAR_TYEAR__; // tropicalyear to seconds
$byear = __SOLAR_BYEAR__; // start base year
$start += ($year - $byear) * $tyear;
if($length < -12) $length = -12;
else if($length > 12) $length = 12;
$smoon = solar::moon2valid($smoon);
$emoon = solar::moon2valid($smoon+$length);
$sidx = (min($smoon,$emoon) - 1) * 2;
$eidx = ((max($smoon,$emoon) - 1) * 2) + 1;
for($i=$sidx; $i<=$eidx; $i++)
{
$time = $start + $tterms[$i];
list(,$atime) = solar::sunl($time,FALSE);
$time += $atime + $addstime + $addttime[$i]; // re-fixed
$terms[calendar::_date('nd',$time)] = &$hterms[$i];
$times[] = $time; // fixed utime
}
## for detail information
##
if(func_num_args() > 3)
{
$i = $sidx;
foreach($times AS $time)
{
$sun[$i] = solar::sun($time,FALSE);
$sun[$i]['_avgdate'] = calendar::_date('D, d M Y H:i:s ',$start+$tterms[$i]-date('Z')).'GMT';
$sun[$i]['_name'] = &$hterms[$i];
$i++;
}
}
unset($times);
return $terms; // array
}
## public, get a Constellation of zodiac
##
function &zodiac($y, $m, $d)
{
static $ffd = array // patch day
(
19030622 => -24, 19221222 => 4, 19540420 => -61, 19550723 => -48,
19551222 => -57, 19560320 => -48, 19580823 => -52, 19600219 => -55,
19610221 => -59, 19620823 => -37, 19651023 => -42, 19870525 => 64,
19880722 => 61, 20230621 => 4, 20300218 => 7
);
$horoscope = array
(
array(chr(187).chr(234).chr(190).chr(231),'Aries'),
array(chr(200).chr(178).chr(188).chr(210),'Taurus'),
array(chr(189).chr(214).chr(181).chr(213).chr(192).chr(204),'Gemini'),
array(chr(176).chr(212),'Cancer'),
array(chr(187).chr(231).chr(192).chr(218),'Leo'),
array(chr(195).chr(179).chr(179).chr(224),'Virgo'),
array(chr(195).chr(181).chr(196).chr(170),'Libra'),
array(chr(192).chr(252).chr(176).chr(165),'Scorpius'),
array(chr(177).chr(195).chr(188).chr(246),'Sagittarius'),
array(chr(191).chr(176).chr(188).chr(210),'Capricon'),
array(chr(185).chr(176).chr(186).chr(180),'Aquarius'),
array(chr(185).chr(176).chr(176).chr(237).chr(177).chr(226),'Pisces')
);
//list(,$nd) = _solar::_terms($y,$m,0);
//$idx = ($m.$d<$nd) ? $m-2 : $m-1;
//if($idx < 0) $idx += 12;
$fk = sprintf('%d%02d%d',$y,$m,$d);
list($L) = solar::sunl(calendar::_mktime(23,59+(int)$ffd[$fk],59,$m,$d,$y));
return $horoscope[floor($L/30)];
}
## public, get sunrise, sunset on Korea
##
## same as PHP5 `date_sunrise()', `date_sunset()'
## http://williams.best.vwh.net/sunrise_sunset_example.htm
## or
## Positional Astronomy: Sunrise, sunset and twilight
## http://star-www.st-and.ac.uk/~fv/webnotes/chapt12.htm
## or
## http://kr.php.net/manual/en/function.date-sunrise.php
##
## [zenith]
## offical = 90 degrees 50'
## civil = 96 degrees
## nautical = 102 degrees
## astronomical = 108 degrees
##
function sunrise_sunset($_y, $_m, $_d, $_location=0, $_zenith=0)
{
static $_locations = array
(
array(126.95,37.55) /* 서울 */, array(131.87,37.24) /* 독도 */,
array(129.37,36.04) /* 포항 */, array(126.35,36.52) /* 안면 */,
);
static $_zeniths = array(90.8333, 96.0, 102.0, 108.0);
//$_timezone = 9.0; // KST +9H
$_timezone = date('Z') / 3600;
## check arguments
##
if(!preg_match('/^[0-3]$/',$_location)) $_location = 0;
if(!preg_match('/^[0-3]$/',$_zenith)) $_zenith = 0;
## inital configurations
##
$location = $_locations[$_location];
$longitude = $location[0];
$latitude = deg2rad($location[1]);
$zenith = deg2rad($_zeniths[$_zenith]);
## 1. first calculate the day of the year
##
$N = floor(275*$_m/9) - (floor(($_m+9)/12) * (1+floor(($_y-4*floor($_y/4)+2)/3))) + $_d - 30;
## 2. convert the longitude to hour value and calculate an approximate time
##
$lhour = $longitude / 15;
$t['r'] = sprintf('%.8f',$N+((6-$lhour)/24.0)); // sunrise
$t['s'] = sprintf('%.8f',$N+((18-$lhour)/24.0)); // sunset
## 3. calculate the Sun's mean anomaly
##
$M['r'] = (0.9856*$t['r']) - 3.289;
$M['s'] = (0.9856*$t['s']) - 3.289;
## 4. calculate the Sun's true longitude
## to be adjusted into the range [0,360) by adding/subtracting 360
##
$L['r'] = $M['r'] + (1.916*sin(deg2rad($M['r']))) + (0.020*sin(deg2rad(2*$M['r']))) + 282.634;
$L['s'] = $M['s'] + (1.916*sin(deg2rad($M['s']))) + (0.020*sin(deg2rad(2*$M['s']))) + 282.634;
$L['r'] = ($L['r']>=0) ? fmod($L['r'],360) : fmod($L['r'],360)+360.0;
$L['s'] = ($L['s']>=0) ? fmod($L['s'],360) : fmod($L['s'],360)+360.0;
$l['r'] = deg2rad($L['r']);
$l['s'] = deg2rad($L['s']);
## 5a. calculate the Sun's right ascension
## to be adjusted into the range [0,360) by adding/subtracting 360
##
$RA['r'] = rad2deg(atan(0.91764*tan($l['r'])));
$RA['s'] = rad2deg(atan(0.91764*tan($l['s'])));
$RA['r'] = ($RA['r']>=0) ? fmod($RA['r'],360) : fmod($RA['r'],360)+360.0;
$RA['s'] = ($RA['s']>=0) ? fmod($RA['s'],360) : fmod($RA['s'],360)+360.0;
## 5b. right ascension value needs to be in the same quadrant as L
##
$RA['r'] += (floor($L['r']/90.0)*90.0) - (floor($RA['r']/90.0)*90.0);
$RA['s'] += (floor($L['s']/90.0)*90.0) - (floor($RA['s']/90.0)*90.0);
## 5c. right ascension value needs to be converted into hours
##
$RA['r'] /= 15;
$RA['s'] /= 15;
## 6. calculate the Sun's declination
##
$sindec['r'] = 0.39782 * sin($l['r']);
$sindec['s'] = 0.39782 * sin($l['s']);
$cosdec['r'] = cos(asin($sindec['r']));
$cosdec['s'] = cos(asin($sindec['s']));
## 7a. calculate the Sun's local hour angle
## (cosH> 1) the sun never rises on this location (on the specified date)
## (cosH<-1) the sun never sets on this location (on the specified date)
##
$cosH['r'] = (cos($zenith) - ($sindec['r']*sin($latitude))) / ($cosdec['r']*cos($latitude));
$cosH['s'] = (cos($zenith) - ($sindec['s']*sin($latitude))) / ($cosdec['s']*cos($latitude));
## 7b. finish calculating H and convert into hours
##
$H['r'] = 360.0 - rad2deg(acos($cosH['r']));
$H['s'] = rad2deg(acos($cosH['s']));
$H['r'] /= 15;
$H['s'] /= 15;
## 8. calculate local mean time of rising/setting
##
$T['r'] = $H['r'] + $RA['r'] - (0.06571*$t['r']) - 6.622;
$T['s'] = $H['s'] + $RA['s'] - (0.06571*$t['s']) - 6.622;
## 9. adjust back to UTC
## to be adjusted into the range [0,24) by adding/subtracting 24
##
$UT['r'] = $T['r'] - $lhour;
$UT['s'] = $T['s'] - $lhour;
$UT['r'] = ($UT['r']>=0) ? fmod($UT['r'],24.0) : fmod($UT['r'],24.0) + 24.0;
$UT['s'] = ($UT['s']>=0) ? fmod($UT['s'],24.0) : fmod($UT['s'],24.0) + 24.0;
## 10. convert UT value to local time zone of latitude/longitude
##
$localT['r'] = fmod($UT['r']+$_timezone,24.0);
$localT['s'] = fmod($UT['s']+$_timezone,24.0);
## last convert localT to human time
##
$sunrise['H'] = floor($localT['r']);
$sunrise['m'] = (int)(($localT['r']-$sunrise['H'])*60);
$sunset['H'] = floor($localT['s']);
$sunset['m'] = (int)(($localT['s']-$sunset['H'])*60);
// good idea, but slow
//return array(date('H:i',$UT['r']*3600),date('H:i',$UT['s']*3600)); // date(UT) to local timezone
return array
(
sprintf('%02d',$sunrise['H']).':'.sprintf('%02d',$sunrise['m']), // sunrise HH:MM
sprintf('%02d',$sunset['H']).':'.sprintf('%02d',$sunset['m']), // sunset HH:MM
);
}
## add san2@2010.07.29
##
function _get_basejd_of_sambok($_y, $_m, $_d)
{
static $basejd = 2451546; // 2451546.6257407409139 2000.01.03 12:00:00, base of kanji, idx 0
list($bjd) = calendar::_getjd($_y,$_m,$_d,12,0,0);
$addterm = (floor($bjd)-$basejd) % 10;
if($addterm > 0) $addterm = 10 - $addterm;
else if($addterm < 0) $addterm = abs($addterm);
return $bjd + $addterm; // JD
}
## add san2@2010.07.29
##
function sambok($_y = NULL)
{
if(!func_num_args()) $_y = date('Y');
$terms = solar::terms($_y,6,2); // solar 24's terms of Jun ~ Oct
$terms = array_keys($terms);
$h[0] = substr($terms[1],0,1);
$h[1] = substr($terms[1],-2);
$l[0] = substr($terms[4],0,1);
$l[1] = substr($terms[4],-2);
## JD
##
$chobok = solar::_get_basejd_of_sambok($_y,$h[0],$h[1]) + 20;
$malbok = solar::_get_basejd_of_sambok($_y,$l[0],$l[1]);
$jungbok = $chobok + 10;
## JD to date
##
$c = calendar::_todate($chobok);
$j = calendar::_todate($jungbok);
$m = calendar::_todate($malbok);
$c = $c[1].sprintf('%02d',$c[2]);
$j = $j[1].sprintf('%02d',$j[2]);
$m = $m[1].sprintf('%02d',$m[2]);
## add korean name
##
$kname['c'] = chr(195).chr(202).chr(186).chr(185);
$kname['j'] = chr(193).chr(223).chr(186).chr(185);
$kname['m'] = chr(184).chr(187).chr(186).chr(185);
return array($c => $kname['c'],$j => $kname['j'],$m => $kname['m']);
}
} // end of class
/*** example ***
require_once 'class.calendar.php';
require_once 'class.solar.php';
$sun = array();
$terms = solar::terms(date('Y'),1,12,&$sun);
print_r($terms);
print_r($sun);
print_r(solar::sun(time()));
echo solar::today()."\n";
echo solar::solar(mktime(0,0,0,3,20))."\n";
echo solar::solar(mktime(0,0,0,3,21))."\n";
echo solar::solar(mktime(0,0,0,3,22))."\n";
echo "\n\n";
print_r(solar::terms(2023));
***/
?>