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";}
$tide_cycle_in_seconds=44700;
$seconds_since_last_synchronised=(time()-$timestamp);
if ($seconds_since_last_synchronised > $tide_cycle_in_seconds)
{$seconds_since_last_high_tide= $seconds_since_last_synchronised % $tide_cycle_in_seconds;}
else {$seconds_since_last_high_tide=$seconds_since_last_synchronised;}
$required_rotation_from_12oclock_position=($seconds_since_last_high_tide/$tide_cycle_in_seconds)*360;
$vml_degrees=$required_rotation_from_12oclock_position-90;
if ($vml_degrees<0) {$vml_degrees=$vml_degrees+360;}
$rotation_modified_for_vml=deg2rad($vml_degrees);
// calculate co-ordinates ------------------------------
$hypotenuse=($icon_diameter/3); // clock hand length
$x=(cos($rotation_modified_for_vml))*$hypotenuse;
$y=(sin($rotation_modified_for_vml))*$hypotenuse;
print "
";
?>
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