A planisphere is a star chart that can be adjusted to show the sky for a specific time and date. It allows you to learn stars and constellations.
Sky & Telescope provides a planisphere that you can print for free. They call it a star wheel. Download it here.
Take the planisphere outside with you to compare the chart to what you see in the sky. You'll need a red flashlight to read it in the dark. If you don't have a red flashlight, cover a regular flashlight with red plastic or paper or tape. The flashlight should not be too bright, or it will ruin your night vision. Set the planisphere to the current date and time, and you're ready to go.
Update: Other versions can be found here and here.
Related post:
How to Use a Planisphere
Saturday, July 12, 2008
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