maybe this thread is useful?
http://forums.topografix.com/index.php?s=58cf595b6916609da3cf4e5293438524&showtopic=1164&pid=6487&st=0&#entry6487
> To: [email protected]
> From: [email protected]
> Date: Mon, 23 Feb 2009 17:45:10 +0000
> Subject: [Community] timezone by coordinates
>
> Dear Geo-Pythonistas,
> do you know any library or Python package which can perform lat/lon based
> calculations?
>
> Specifically, I am looking to find a way to get the time zone for an arbitray
> pair of coordinates.
> There are some webservices which can provide such information (e.g. Geonames)
> but do all require that the script has online access to these services.
>
> Do you know of any attemt to achive this without querying a webservice?
>
> Thanks in adavance and kind regards!
> Timmie
>
> P.S.: I hope that this list is the rigt place to ask such questions...
>
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