Bug in Moonphase & Moonangle

[slarta]

Hello gregseth!

PHP 5.6.3 (cli) (built: Nov 14 2014 20:21:33)
Zend Engine v2.6.0
with Zend OPcache v7.0.4-dev

<?php 
date_default_timezone_set('UTC');
include 'suncalc.php';
$timestampinput = '367930576.999999';
$datetime = new DateTime();
$datetime->setTimestamp($timestampinput);
$suncalc = new SunCalc($datetime, 0.0, 0.0);
$moonillumination = $suncalc->getMoonIllumination();
$moonfraction = $moonillumination["fraction"];
$moonphase = $moonillumination["phase"];
$moonangle = $moonillumination["angle"];
echo "Timestamp: $timestampinput";
echo "Fraction: $moonfraction";
echo "Phase: $moonphase";
echo "Angle: $moonangle";
?>

Timestamp: 367930576.999999
Fraction: 0.00055706175882264
Phase: 0.99248650278035
Angle: 3.1415787022219

Timestamp: 367930577.000000
Fraction: 0.00055704489929154
Phase: 0.0075133834992909
Angle: -3.1415560468408

There is a jump in the moon phase of 0.0150268807 and a jump in the moon angle of 6.2831347491 within a microsecond. Normally this must be several minutes difference.

Please answer.

[gregseth]

Hi,

The PHP function setTimestamp takes an integer, so the real difference between you two tests is one second, not one microsecond.

Plus, the angle is within ]-π; π] and the phase within [0; 1[, they're just cycling around.