Real Time ISS Location Example

realtime.php

<?php

date_default_timezone_set('America/Los_Angeles');

require_once 'Predict.php';
require_once 'Predict.php';
require_once 'Predict/Sat.php';
require_once 'Predict/QTH.php';
require_once 'Predict/Time.php';
require_once 'Predict/TLE.php';

// San Francisco is the observing location, which is required
$qth      = new Predict_QTH();
$qth->lat = 37.790252;   // Latitude North
$qth->lon = -122.419968; // Longitude East

// The iss.tle file is the first 3 lines of
// http://celestrak.com/NORAD/elements/stations.txt
// Make sure you update this content, it goes out of date within a day or two
$tleFile = file('iss.tle'); // Load up the ISS data file from NORAD
$tle     = new Predict_TLE($tleFile[0], $tleFile[1], $tleFile[2]); // Instantiate it
$sat     = new Predict_Sat($tle); // Load up the satellite data
$now     = Predict_Time::get_current_daynum(); // get the current time as Julian Date (daynum)

// Calculate the current location of the satellite
$predict  = new Predict();
$predict->predict_calc($sat, $qth, $now);

$kph = $sat->velo * 60 * 60;
$mph = $kph * Predict::km2mi;

$zone = new DateTimezone('America/Los_Angeles');
$date = new DateTime();
$date->setTimezone($zone);
$date->setTimestamp(Predict_Time::daynum2unix($now));
$time = $date->format('m-d-Y g:i:s a T');

// Output data
echo "ISS Current Position: \n\n";
echo "    Latitude:  " . $sat->ssplat . "\n";
echo "    Longitude: " . $sat->ssplon . "\n";
echo "    Altitude:  " . number_format($sat->alt * Predict::km2mi, 2) . ' miles up' . "\n";
echo "    Velocity:  " . number_format($mph, 2) . " mph\n";
echo "    Date/Time: " . $time . "\n";