Observe solar eclipses
http://www.classzone.com/books/earth_science/terc/content/visualizations/es2505/es2505page01.cfm?chapter_no=visualizatio

Tom Grace, Exploring Earth


Eclipses occur when the new moon shadow passes between the Earth and the sun. Three different eclipses can be viewed on the same page, total, partial, and annular. The nature of the eclipse depends both on alignment angle and distances between the sun, earth, and moon. The animation can be paused and rewound to emphasize important points.

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This resource is referenced here:Keywords: astronomy, solar eclipse