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<?php $lat1 = 35.697959; $lat2 = 35.697959; $lon1 = 139.707085; $lon2 = 139.707085; $theta = $lon1 - $lon2; $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta)); var_dump($dist); $dist = acos($dist); var_dump($dist); $dist = 1; $dist = acos($dist); var_dump($dist);
Output for git.master, git.master_jit, rfc.property-hooks
float(1.0000000000000002) float(NAN) float(0)

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