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Earth structure  
Earth history  
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1 to 2 hours  
Materials Cost:
$1 - $5  
SMD Forum - Primary:
Heliophysics  
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This activity explores how ancient Sun observers made use of natural and built structures to mark solar alignments observed at different times of the year, particularly around the solstices and equinoxes. In Part 1, the teacher prepares a horizon... (View More)

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