Navigator Star finder is a Java applet that shows the visible sky in any position, at any time. The chart is a polar representation where the angle represents the azimuth and the distance from the edge is the altitude of the celestial body.
By pointing a celestial body with the mouse, a "hint" will show with basic nautical almanac data (GHA, declination, right ascension, instrumental altitude and azimuth).
A number of people asked me if they could put the star finder applet in their website. The answer is yes! But putting the applet alone in your website directory will not work because this applet communicates with a CGI that does all the celestial calculations. And this CGI is specific to my webserver. Will probably not work in your ISP server anyway.
But I have made it simple to setup a link that displays the sky in a given position and current time. Suppose your city is located at latitude 23°30'S and longitude 46°30' W. The link would look like this:
<a href="http://www.tecepe.com.br/cgi-win/cgiasvis.exe/-23.5:46.5">The sky over São Paulo, now</a>