HeyWhatsThat Planisphere for Google Earth
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Click here to overlay the night sky in Google Earth with a grid showing you what you can see right now, including the positions of the Sun, Moon and planets (and Pluto too), if you're inside the blue box on the map. You can move the box by clicking on the map.
If you want more control over the planisphere — setting a specific time or time span, overlaying the sky with your true horizon and the names of surrounding summits, or searching for an address — head over to the advanced planisphere.
 
Requires the Google Sky functionality in beta 4.2 or later of Google Earth. We estimate your location from the IP address of your computer, using GeoLite data created by MaxMind, available from http://maxmind.com/.