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Making a Horizontal sundial
Lessons explaining how to make a simple portable sundial (necklace or keychain horizontal sundial).Plus information how to find a true north and about the Sun's Path in the Sky.
URL:
http://solar.physics.montana.edu/YPOP/Classroom/Lessons/Sundials/sundials.html
Our rating:
Added: 14-10-2006
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Przykładowe miejsce nr 4 na reklamę