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@ 2015-12-01T15:24:58Z

<?php

$var = (float)1;

$lat2 = 56.6404468;
$lon2 = 22.4747625;
$lat1 = 56.6404468;
$lon1 = 22.4747622;
$theta = $lon1 - $lon2;
$var = sin( deg2rad( $lat1 ) ) * sin( deg2rad( $lat2 ) ) + cos( deg2rad( $lat1 ) ) * cos( deg2rad( $lat2 ) ) * cos( deg2rad( $theta ) );

var_dump( acos( $var ) ); // float NAN

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
sin: documentation ( source)
cos: documentation ( source)
acos: documentation ( source)
deg2rad: documentation ( source)

preferences:dark modelive preview

50.06 ms | 402 KiB | 5 Q