<?php
class moon {
private $date;
/*
* set a property, only date at this time
* @param prop
* @param val
* @return bool
*/
public function set($prop, $val) {
$r = false;
switch ($prop) {
case "date":
$r = $this->date = is_numeric($val) ? $val : strtotime($val);
}
return (bool) $r;
}
/*
* calc moon phase percentage for a date
* @return int
*/
public function get_phase_percent() {
$r = false;
if ($this->date) {
$x = ($this->date - 603240) / 2551392;
$x -= (int) $x;
$r = round($x * 100);
}
return $r;
}
/*
* calc moon visibility
* @return int
*/
public function get_visibility() {
$r = false;
if ($this->date) $r = (50 - abs(50 - $this->get_phase_percent())) * 2;
return $r;
}
/*
* calc when new phase start
* @param ts if true return unix timestamp
* @return string
*/
public function get_next_newmoon($ts = false) {
$r = false;
if ($this->date) $r = $this->date + 2551392 - ($this->date - 603240) % 2551392;
return $ts ? $r : date("Y-m-d", $r);
}
/*
* calc next full moon
* @param ts if true return unix timestamp
* @return string
*/
public function get_next_fullmoon($ts = false) {
$r = false;
if ($this->date) $r = $this->get_next_newmoon(true) + 1275696;
return $ts ? $r : date("Y-m-d", $r);
}
/*
* get moon phase name
* @return string
*/
public function get_phase_name() {
$r = false;
if ($this->date) {
$x = round($this->get_phase_percent() * 0.1) * 10;
if ($x == 0 || $x == 100) $r = "New";
elseif ($x > 0 && $x < 25) $r = "Waxing crescent";
elseif ($x == 25) $r = "First quarter";
elseif ($x > 25 && $x < 50) $r = "Waxing gibbous";
elseif ($x == 50) $r = "Full";
elseif ($x > 50 && $x < 75) $r = "Waning gibbous";
elseif ($x == 75) $r = "Last quarter";
elseif ($x > 75) $r = "Waning crescent";
}
return $r;
}
}
?>
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