We make a poster and used it to model the motions of the inner planets Mercury, Venus, Earth, and Mars as they went around the Sun in Earth year 2005. You and your students can model the motions of the inner planets for the school year of your choice. Attention span: one school year. Time to do it: 30 to 60 minutes to make the poster, a few minutes once a month for students to update the poster. Learning payoff: learn about the motions of the planets, long attention span for small investment in time.

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