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* kumar mcmillan
*
* description:
* do moon phase calculation stuff
* You will see a slight drift in the cycle if you compare the results to other phase calculations...
* this is probably because of different degrees of precision among phase periods used, as well as
* float precision from computer to computer. It is more or less accurate and seems to always report the
* correct phase name. Please let us know if you have any improvements, suggestions
* or questions. Do not make modifications to this class in case the source changes (see moon-phase.php
* for an example of usage).
*/
define('MP_NEW_MOON_NAME','New Moon');
define('MP_NEW_MOON_ID',0);
define('MP_WAXING_CRESCENT_NAME','Waxing Crescent');
define('MP_WAXING_CRESCENT_ID',1);
define('MP_FIRST_QUARTER_NAME','First Quarter Moon');
define('MP_FIRST_QUARTER_ID',2);
define('MP_WAXING_GIBBOUS_NAME','Waxing Gibbous');
define('MP_WAXING_GIBBOUS_ID',3);
define('MP_FULL_MOON_NAME','Full Moon');
define('MP_FULL_MOON_ID',4);
define('MP_WANING_GIBBOUS_NAME','Waning Gibbous');
define('MP_WANING_GIBBOUS_ID',5);
define('MP_THIRD_QUARTER_MOON_NAME','Third Quarter Moon');
define('MP_THIRD_QUARTER_MOON_ID',6);
define('MP_WANING_CRESCENT_NAME','Waning Crescent');
define('MP_WANING_CRESCENT_ID',7);
define('MP_DAY_IN_SECONDS', 60 * 60 * 24);
class moonPhase {
var $allMoonPhases = array();
var $dateAsTimeStamp;
var $moonPhaseIDforDate;
var $moonPhaseNameForDate;
var $periodInDays = 29.53058867; // == complete moon cycle
var $periodInSeconds = -1; // gets set when you ask for it
var $someFullMoonDate;
/*
* CONSTRUCTOR
* $timestamp (int) date of which to calculate a moon phase and relative phases for
*/
function moonPhase($timeStamp = -1) {
$this->allMoonPhases = array(
MP_NEW_MOON_NAME,
MP_WAXING_CRESCENT_NAME,
MP_FIRST_QUARTER_NAME,
MP_WAXING_GIBBOUS_NAME,
MP_FULL_MOON_NAME,
MP_WANING_GIBBOUS_NAME,
MP_THIRD_QUARTER_MOON_NAME,
MP_WANING_CRESCENT_NAME);
// set base date, that we know was a full moon:
// (http://aa.usno.navy.mil/data/docs/MoonPhase.html)
$this->someFullMoonDate = strtotime("December 8 2003 20:37 UTC");
$this->someFullMoonDate = strtotime("December 12 2008 16:37 UTC");
//$this->someFullMoonDate = strtotime("August 22 2002 22:29 UTC");
if($timeStamp == '' or $timeStamp == -1) $timeStamp = time();
$this->setDate($timeStamp);
} // END function moonPhase($timeStamp = -1) {
/*
* PRIVATE
* sets the moon phase ID and moon phase name internally
*/
function calcMoonPhase() {
$position = $this->getPositionInCycle();
if($position >= 0.474 && $position <= 0.53)
$phaseInfoForCurrentDate = array(MP_NEW_MOON_ID, MP_NEW_MOON_NAME);
else if ($position >= 0.53 && $position <= 0.724)
$phaseInfoForCurrentDate = array(MP_WAXING_CRESCENT_ID, MP_WAXING_CRESCENT_NAME);
else if ($position >= 0.724 && $position <= 0.776)
$phaseInfoForCurrentDate = array(MP_FIRST_QUARTER_ID, MP_FIRST_QUARTER_NAME);
else if ($position >= 0.776 && $position <= 0.974)
$phaseInfoForCurrentDate = array(MP_WAXING_GIBBOUS_ID, MP_WAXING_GIBBOUS_NAME);
else if ($position >= 0.974 || $position <= 0.026)
$phaseInfoForCurrentDate = array(MP_FULL_MOON_ID, MP_FULL_MOON_NAME);
else if ($position >= 0.026 && $position <= 0.234)
$phaseInfoForCurrentDate = array(MP_WANING_GIBBOUS_ID, MP_WANING_GIBBOUS_NAME);
else if ($position >= 0.234 && $position <= 0.295)
$phaseInfoForCurrentDate = array(MP_THIRD_QUARTER_MOON_ID, MP_THIRD_QUARTER_MOON_NAME);
else if ($position >= 0.295 && $position <= 0.4739)
$phaseInfoForCurrentDate = array(MP_WANING_CRESCENT_ID, MP_WANING_CRESCENT_NAME);
list($this->moonPhaseIDforDate,$this->moonPhaseNameForDate) = $phaseInfoForCurrentDate;
} // END function calcMoonPhase() {
/*
* PUBLIC
* return (array) all moon phases as ID => Name
*/
function getAllMoonPhases() {
return $this->allMoonPhases;
} // END function getAllMoonPhases() {
/*
* PUBLIC
*/
function getBaseFullMoonDate() {
return $this->someFullMoonDate;
} // END function getBaseFullMoonDate() {
/*
* PUBLIC
* return (int) timestamp of the current date being calculated
*/
function getDateAsTimeStamp() {
return $this->dateAsTimeStamp;
} // END function getDateAsTimeStamp() {
/*
* PUBLIC
*/
function getDaysUntilNextFullMoon() {
$position = $this->getPositionInCycle();
return round((1 - $position) * $this->getPeriodInDays(), 2);
} // ENDfunction getDaysUntilNextFullMoon() {
/*
* PUBLIC
*/
function getDaysUntilNextLastQuarterMoon() {
$days = 0;
$position = $this->getPositionInCycle();
if ($position < 0.25)
$days = (0.25 - $position) * $this->getPeriodInDays();
else if ($position >= 0.25)
$days = (1.25 - $position) * $this->getPeriodInDays();
return round($days, 1);
} // END function getDaysUntilNextLastQuarterMoon() {
/*
* PUBLIC
*/
function getDaysUntilNextFirstQuarterMoon() {
$days = 0;
$position = $this->getPositionInCycle();
if ($position < 0.75)
$days = (0.75 - $position) * $this->getPeriodInDays();
else if ($position >= 0.75)
$days = (1.75 - $position) * $this->getPeriodInDays();
return round($days,1);
} // END function getDaysUntilNextFirstQuarterMoon() {
/*
* PUBLIC
*/
function getDaysUntilNextNewMoon() {
$days = 0;
$position = $this->getPositionInCycle();
if ($position < 0.5)
$days = (0.5 - $position) * $this->getPeriodInDays();
else if ($position >= 0.5)
$days = (1.5 - $position) * $this->getPeriodInDays();
return round($days, 1);
} // END function getDaysUntilNextNewMoon() {
/*
* PUBLIC
* returns the percentage of how much lunar face is visible
*/
function getPercentOfIllumination() {
// from http://www.lunaroutreach.org/cgi-src/qpom/qpom.c
// C version: // return (1.0 - cos((2.0 * M_PI * phase) / (LPERIOD/ 86400.0))) / 2.0;
$percentage = (1.0 + cos(2.0 * M_PI * $this->getPositionInCycle())) / 2.0;
$percentage *= 100;
$percentage = round($percentage,1) . '%';
return $percentage;
} // END function getPercentOfIllumination()
/*
* PUBLIC
*/
function getPeriodInDays() {
return $this->periodInDays;
} // END function getPeriodInDays() {
/*
* PUBLIC
*/
function getPeriodInSeconds() {
if($this->periodInSeconds > -1) return $this->periodInSeconds; // in case it was cached
$this->periodInSeconds = $this->getPeriodInDays() * MP_DAY_IN_SECONDS;
return $this->periodInSeconds;
} // END function getPeriodInSeconds() {
/*
* PUBLIC
*/
function getPhaseID() {
return $this->moonPhaseIDforDate;
} // EMD function getPhaseID() {
/*
* PUBLIC
* $ID (int) ID of phase, default is to get the phase for the current date passed in constructor
*/
function getPhaseName($ID = -1) {
if($ID <= -1)
return $this->moonPhaseNameForDate; // get name for this current date
return $this->allMoonPhases[$ID]; // or.. get name for a specific ID
} // END function getPhaseName() {
/*
* PUBLIC
* return (float) number between 0 and 1. 0 or 1 is the beginning of a cycle (full moon)
* and 0.5 is the middle of a cycle (new moon).
*/
function getPositionInCycle() {
$diff = $this->getDateAsTimeStamp() - $this->getBaseFullMoonDate();
$periodInSeconds = $this->getPeriodInSeconds();
$position = ($diff % $periodInSeconds) / $periodInSeconds;
if ($position < 0)
$position = 1 + $position;
return $position;
} // END function getPositionInCycle() {
/*
* PUBLIC
* $newStartingDateAsTimeStamp (int) set a new date to start the week at, or use the current date
* return (array[6]) weekday timestamp => phase for weekday
*/
function getUpcomingWeekArray($newStartingDateAsTimeStamp = -1) {
$newStartingDateAsTimeStamp = ($newStartingDateAsTimeStamp > -1)
? $newStartingDateAsTimeStamp
: $this->getDateAsTimeStamp();
$moonPhaseObj = get_class($this);
$weeklyPhase = new $moonPhaseObj($newStartingDateAsTimeStamp);
$upcomingWeekArray = array();
for( $day = 0, $thisTimeStamp = $weeklyPhase->getDateAsTimeStamp();
$day < 7; $day++, $thisTimeStamp += MP_DAY_IN_SECONDS) {
$weeklyPhase->setDate($thisTimeStamp);
$upcomingWeekArray[$thisTimeStamp] = $weeklyPhase->getPhaseID();
} // END for($day = 0; $day < 7; $day++) {
unset($weeklyPhase);
return $upcomingWeekArray;
} // END function getUpcomingWeekArray($newStartingDateAsTimeStamp = -1) {
/*
* PUBLIC
* sets the internal date for calculation and calulates the moon phase for that date.
* called from the constructor.
* $timeStamp (int) date to set as unix timestamp
*/
function setDate($timeStamp = -1) {
if($timeStamp == '' or $timeStamp == -1) $timeStamp = time();
$this->dateAsTimeStamp = $timeStamp;
$this->calcMoonPhase();
} // END function setDate($timeStamp) {
//Added function to show moon pics
function setPicture() {
$position = $this->getPositionInCycle();
if($position >= 0.4643 && $position <= 0.5357)
$image = "moon1.gif";
else if ($position >= 0.5358 && $position <= 0.5714)
$image = "moon2.gif";
else if ($position >= 0.5715 && $position <= 0.6071)
$image = "moon2.gif";
else if ($position >= 0.6072 && $position <= 0.6429)
$image = "moon3.gif";
else if ($position >= 0.6430 && $position <= 0.6786)
$image = "moon4.gif";
else if ($position >= 0.6787 && $position <= 0.7143)
$image = "moon5.gif";
else if ($position >= 0.7144 && $position <= 0.7500)
$image = "moon6.gif";
else if ($position >= 0.7501 && $position <= 0.7857)
$image = "moon7.gif";
else if ($position >= 0.7858 && $position <= 0.8214)
$image = "moon8.gif";
else if ($position >= 0.8215 && $position <= 0.8571)
$image = "moon9.gif";
else if ($position >= 0.8572 && $position <= 0.8929)
$image = "moon10.gif";
else if ($position >= 0.8930 && $position <= 0.9286)
$image = "moon11.gif";
else if ($position >= 0.9287 && $position <= 0.9643)
$image = "moon12.gif";
else if ($position >= 0.9644 && $position <= 1.0000)
$image = "moon13.gif";
else if ($position >= 1.0001 && $position <= 0.0000)
$image = "moon14.gif";
else if ($position >= 0.0001 && $position <= 0.0357)
$image = "moon15.gif";
else if ($position >= 0.0358 && $position <= 0.0714)
$image = "moon16.gif";
else if ($position >= 0.0715 && $position <= 0.1071)
$image = "moon17.gif";
else if ($position >= 0.1072 && $position <= 0.1429)
$image = "moon18.gif";
else if ($position >= 0.1430 && $position <= 0.1786)
$image = "moon19.gif";
else if ($position >= 0.1787 && $position <= 0.2143)
$image = "moon20.gif";
else if ($position >= 0.2144 && $position <= 0.2500)
$image = "moon21.gif";
else if ($position >= 0.2501 && $position <= 0.2857)
$image = "moon22.gif";
else if ($position >= 0.2858 && $position <= 0.3214)
$image = "moon23.gif";
else if ($position >= 0.3215 && $position <= 0.3571)
$image = "moon24.gif";
else if ($position >= 0.3572 && $position <= 0.3929)
$image = "moon25.gif";
else if ($position >= 0.3930 && $position <= 0.4286)
$image = "moon26.gif";
else if ($position >= 0.4287 && $position <= 0.4643)
$image = "moon27.gif";
return $image;
} // END function setPicture() {
} // END class moonPhase {
?>
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Februari 2012