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Making a clock-accurate sundial : customized to your location (for the northern hemisphere)
- "Presents step-by-step instructions for making a sundial which will illustrate concepts regarding the interrelation of the sun, the earth's rotation, and time."
- "Making a clock-accurate sundial : customized to your location (for the northern hemisphere)"
- "Making a clock-accurate sundial : customized to your location (for the Northern Hemisphere)"