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Project title How to measure the diameter of the sun
Difficulty Level Elementary school
Main link Click here to view all details of this science project (Cached)  (View 3rd party site)

Description
The earth is approximately 150,000,000 km from the sun. This distance varies somewhat with the seasons because of Earth's elliptical orbit. Yet, a simple instrument can be constructed which will provide measurement data that permits a relatively accurate measurement of the sun's diameter.  

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