PHP Sunrise Sunset Script Alteration

[maciek]

Here is the script to calculate sunset sunrise anywhere around the world


<?php class sun
{
var $latitude; #szerokosc geograficzna
var $longitude; #dlugosc geograficzna
var $timezone; #strefa czasowa
function sun ($latitude, $longitude, $timezone)
{
$this->latitude = $latitude;
$this->longitude = $longitude;
$this->timezone = $timezone;
$this->yday = date("z");
$this->mon = date("n");
$this->mday = date("j");
$this->year = date("Y");
#---------------------
$this->DST=$this->is_daylight_time(date("U"));
if ($this->DST)
{
$this->timezone = ($this->timezone + 1);
}
if ($this->timezone == "13")
{
$this->timezone = "-11";
}
#---------------------
$this->A = 1.5708;
$this->B = 3.14159;
$this->C = 4.71239;
$this->D = 6.28319;
$this->E = 0.0174533 * $this->latitude;
$this->F = 0.0174533 * $this->longitude;
$this->G = 0.261799 * $this->timezone;
#---------------------
# For astronomical twilight, use
#$this->R = -.309017;
# For nautical twilight, use
#$this->R = -.207912;
# For civil twilight, use
#$this->R = -.104528;
# For sunrise or sunset, use
$this->R = -.0145439;
#---------------------

}
function is_daylight_time($time)
{
list($dom, $dow, $month, $hour, $min) = explode(":", date("d:w:m:H:i", $time));
if ($month > 4 && $month < 10)
{
$this->retval = 1; # May thru September
}
elseif ($month == 4 && $dom > 7)
{
$this->retval = 1; # After first week in April
}
elseif ($month == 4 && $dom <= 7 && $dow == 0 && $hour >= 2)
{
$this->retval = 1; # After 2am on first Sunday ($dow=0) in April
}
elseif ($month == 4 && $dom <= 7 && $dow != 0 && ($dom-$dow > 0))
{
$this->retval = 1; # After Sunday of first week in April
}
elseif ($month == 10 && $dom < 25)
{
$this->retval = 1; # Before last week of October
}
elseif ($month == 10 && $dom >= 25 && $dow == 0 && $hour < 2)
{
$this->retval = 1; # Before 2am on last Sunday in October
}
elseif ($month == 10 && $dom >= 25 && $dow != 0 && ($dom-24-$dow < 1) )
{
$this->retval = 1; # Before Sunday of last week in October
}
else
{
$this->retval = 0;
}



return $this->retval;
}
function sunrise()
{
$J = $this->A;
$K = $this->yday + (($J - $this->F) / $this->D);
$L = ($K * .017202) - .0574039; # Solar Mean Anomoly
$M = $L + .0334405 * sin($L); # Solar True Longitude
$M += 4.93289 + (3.49066E-04) * sin(2 * $L);
if ($this->D == 0)
{
echo "Trying to normalize with zero offset..."; exit;
}
while ($M < 0)
{
$M = ($M + $this->D);
}
while ($M >= $this->D)
{
$M = ($M - $this->D);
}
if (($M / $this->A) - intval($M / $this->A) == 0)
{
$M += 4.84814E-06;
}
$P = sin($M) / cos($M); # Solar Right Ascension
$P = atan2(.91746 * $P, 1);
# Quadrant Adjustment
if ($M > $this->C)
{
$P += $this->D;
}
else
{
if ($M > $this->A)
{
$P += $this->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 = $this->R - (sin($Q) * sin($this->E));
$S = $S / (cos($Q) * cos($this->E));
if (abs($S) > 1)
{
echo 'none';
} # Null phenomenon
$S = $S / sqrt(-$S * $S + 1);
$S = $this->A - atan2($S, 1);
$S = $this->D - $S ;
$T = $S + $P - 0.0172028 * $K - 1.73364; # Local apparent time
$U = $T - $this->F; # Universal timer
$V = $U + $this->G; # Wall clock time
# Quadrant Determination
if ($this->D == 0)
{
echo "Trying to normalize with zero offset..."; exit;
}
while ($V < 0)
{
$V = ($V + $this->D);
}
while ($V >= $this->D)
{
$V = ($V - $this->D);
}
$V = $V * 3.81972;
$hour = intval($V);
$min = intval((($V - $hour) * 60) + 0.5);
echo date( "G:i ", mktime($hour,$min,0,$this->mon,$this->mday,$this->year) );

}
function sunset()
{
$J = $this->C;
$K = $this->yday + (($J - $this->F) / $this->D);
$L = ($K * .017202) - .0574039; # Solar Mean Anomoly
$M = $L + .0334405 * sin($L); # Solar True Longitude
$M += 4.93289 + (3.49066E-04) * sin(2 * $L);
if ($this->D == 0)
{
echo "Trying to normalize with zero offset..."; exit;
}
while ($M < 0)
{
$M = ($M + $this->D);
}
while ($M >= $this->D)
{
$M = ($M - $this->D);
}
if (($M / $this->A) - intval($M / $this->A) == 0)
{
$M += 4.84814E-06;
}
$P = sin($M) / cos($M); # Solar Right Ascension
$P = atan2(.91746 * $P, 1);
# Quadrant Adjustment
if ($M > $this->C)
{
$P += $this->D;
}
else
{
if ($M > $this->A)
{
$P += $this->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 = $this->R - (sin($Q) * sin($this->E));
$S = $S / (cos($Q) * cos($this->E));
if (abs($S) > 1)
{
echo 'none';
} # Null phenomenon
$S = $S / sqrt(-$S * $S + 1);
$S = $this->A - atan2($S, 1);
#$S = $this->D - $S ;
$T = $S + $P - 0.0172028 * $K - 1.73364; # Local apparent time
$U = $T - $this->F; # Universal timer
$V = $U + $this->G; # Wall clock time
# Quadrant Determination
if ($this->D == 0)
{
echo "Trying to normalize with zero offset..."; exit;
}
while ($V < 0)
{
$V = ($V + $this->D);
}
while ($V >= $this->D)
{
$V = ($V - $this->D);
}
$V = $V * 3.81972;
$hour = intval($V);
$min = intval((($V - $hour) * 60) + 0.5);
echo date( "G:i ", mktime($hour,$min,0,$this->mon,$this->mday,$this->year) );
}

}
?>

Here is the script to display the information


<?php
require_once('sun_class.php');

$sun = new sun('50', '21', '1');
$sun->sunrise();
$sun->sunset();
?>

I have an issue with making the TIME of sunset and sunrise a useful variable since

$sun->sunrise();
$sun->sunset();

are not useful variables. Lets say $sun->sunrise(); puts out 09:50 AM. I would like to use this information for other functions.

$TIME = $sun->sunrise(); = 09:50 AM

How can I do this?

[Pollux]

$TIME = $sun->sunrise(); = 09:50 AM

How can I do this?

Try to replace last rows in both function :

echo date( "G:i ", mktime($hour,$min,0,$this->mon,$this->mday,$this->year) );
to

return date( "G:i ", mktime($hour,$min,0,$this->mon,$this->mday,$this->year) );
and

$TIME = $sun->sunrise();
must be useful variables!

If you want to print data again "$sun->sunrise(); = 09:50 AM" have to do this

echo $sun->sunrise();