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Want a guide to the stars that tracks their movement through the years? You want our virtual planisphere - an online map which lets you find the constellations in the night sky. Compare what you see on your monitor with what you can see from your window. 
Click here to launch the survey You will need Flash to launch the survey. If you don’t have it on your computer, click here to download the free Flash software. The BBC and the Open University are not responsible for the content of external websites.
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