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Earth' rotation, Earth' rotation. earth' rotation apparent daily motion sky . earth rotates imaginary line passes north. http://www.polaris.iastate.edu/NorthStar/Unit3/unit3_sub1.htm Asd planetarium: reasons seasons, Earth’ changing distance sun: closely picture. sun center earth’ orbit.. http://www.astronomy.org/programs/seasons/index.html Eye sky: lesson plan - motion sun earth, Summary activity: activity students concrete model sun earth motion.. http://www.eyeonthesky.org/lessonplans/07sun_motionclass.html