HeyWhatsThat Planisphere for Google Earth
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The planisphere overlays 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 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.