воскресенье, 17 марта 2013 г.


Science Kids at HomeThroughout the ages, people, animals and even plants have been using the sun to tell time.  The Earth revolves around the sun at a constant speed.  On the Earth, it looks like the sun rises in the East and then sets in the west, moving across the sky in a predictable way.  With a sundial, you can use the sun to reliably tell time throughout the day..
Do you want your own sundials? You can read an instruction in your student's book, watch video instructions or use Internet resources click here>>>  

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