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<?php
$block_name = _("Sunrise/Sunset");
/**
* $Horde: horde/lib/Block/sunrise.php,v 1.14.10.4 2007/12/20 15:01:36 jan Exp $
*
* @package Horde_Block
*/
class Horde_Block_Horde_sunrise extends Horde_Block {
var $_app = 'horde';
function _title()
{
return _("Sunrise/Sunset");
}
function _params()
{
$params = array('location' => array('type' => 'mlenum',
'name' => _("Location"),
'default' => '51.517:-0.117'));
global $coordinates;
if (!is_array($coordinates)) {
include 'Horde/NLS/coordinates.php';
if (!is_array($coordinates)) {
$coordinates = array();
}
}
$params['location']['values'] = $coordinates;
return $params;
}
function _content()
{
if (empty($this->_params['location'])) {
return _("No location is set.");
}
// Set the timezone variable, if available.
NLS::setTimeZone();
list($lat, $long) = explode(':', $this->_params['location']);
$rise = $this->_calculateSunset(time(), $lat, $long, false, floor(date('Z') / 3600));
$set = $this->_calculateSunset(time(), $lat, $long, true, floor(date('Z') / 3600));
$location = '';
global $coordinates;
if (!is_array($coordinates)) {
require 'Horde/NLS/coordinates.php';
}
foreach ($coordinates as $country) {
if (array_key_exists($this->_params['location'], $country)) {
$location = $country[$this->_params['location']];
break;
}
}
return '<table width="100%" height="100%" cellspacing="0"><tr>' .
'<td colspan="2" class="control"><strong>' . $location . '</strong></td></tr><tr height="100%">' .
'<td width="50%" align="center">' .
Horde::img('block/sunrise/sunrise.png', _("Sun Rise")) .
'<br />' . $rise . '</td>' .
'<td width="50%" align="center">' .
Horde::img('block/sunrise/sunset.png', _("Sun Set")) .
'<br />' . $set . '</td>' . '</tr></table>';
}
/**
* http://www.zend.com/codex.php?id=135&single=1
*/
function _calculateSunset($date, $latitude, $longitude, $sunset = true, $timezone)
{
$yday = date('z', $date);
$mon = date('n', $date);
$mday = date('j', $date);
$year = date('Y', $date);
if ($timezone == '13') {
$timezone = '-11';
$mday++;
$yday++;
}
$A = 1.5708;
$B = 3.14159;
$C = 4.71239;
$D = 6.28319;
$E = 0.0174533 * $latitude;
$F = 0.0174533 * $longitude;
$G = 0.261799 * $timezone;
// For astronomical twilight, use R = -.309017
// For nautical twilight, use R = -.207912
// For civil twilight, use R = -.104528
// For sunrise or sunset, use R = -.0145439
$R = -.0145439;
if ($sunset) {
$J = $C;
} else {
$J = $A;
}
$K = $yday + (($J - $F) / $D);
$L = ($K * .017202) - .0574039; // Solar Mean Anomoly
$M = $L + .0334405 * sin($L); // Solar True Longitude
$M += 4.93289 + (3.49066E-04) * sin(2 * $L); // Quadrant Determination
while ($M < 0) {
$M = ($M + $D);
}
while ($M >= $D) {
$M = ($M - $D);
}
if (($M / $A) - intval($M / $A) == 0) {
$M += 4.84814E-06;
}
$P = sin($M) / cos($M); // Solar Right Ascension
$P = atan2(.91746 * $P, 1);
// Quadrant Adjustment
if ($M > $C) {
$P += $D;
} elseif ($M > $A) {
$P += $B;
}
$Q = .39782 * sin($M); // Solar Declination
$Q = $Q / sqrt(-$Q * $Q + 1); // This is how the original author wrote it!
$Q = atan2($Q, 1);
$S = $R - (sin($Q) * sin($E));
$S = $S / (cos($Q) * cos($E));
if (abs($S) > 1) {
return 'none'; // Null phenomenon
}
$S = $S / sqrt(-$S * $S + 1);
$S = $A - atan2($S, 1);
if (!$sunset) {
$S = $D - $S ;
}
$T = $S + $P - 0.0172028 * $K - 1.73364; // Local apparent time
$U = $T - $F; // Universal timer
$V = $U + $G; // Wall clock time
// Quadrant Determination
while ($V < 0) {
$V = ($V + $D);
}
while ($V >= $D) {
$V = ($V - $D);
}
$V = $V * 3.81972;
$hour = intval($V);
$V -= $hour;
$min = intval($V * 60);
$V -= $min / 60;
$sec = intval($V * 3600);
return strftime('%X', mktime($hour, $min, $sec, $mon, $mday, $year));
}
}
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