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<?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 for git.master, git.master_jit, rfc.property-hooks
float(NAN)

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