MadSci Network: Astronomy

Subject: How do we know that a year has passed.

Date: Fri Jan 12 09:01:17 2001
Posted by mar
Grade level: 10-12 School: No school entered.
City: bklyn State/Province: ny Country: usa
Area of science: Astronomy
ID: 979308077.As

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Re: How do we know that a year has passed.

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