Had you turned on warnings, you would have figured this out yourself.

Argument "Azimuth" isn't numeric in numeric ne (!=) at www.pl line 6.
Argument "a" isn't numeric in numeric ne (!=) at www.pl line 6.
    <tr>
        <td width="0" height="0">a</td>
        <td width="0" height="0">a</td>
        <td width="0" height="0">a</td>
        <td width="0" height="0">a</td>
        <td width="0" height="0">a</td>
    <td width="0" height="0">a</td>
    </tr>
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Turn on warning by using 'use warnings', or run with -w option.