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This lesson is part of the <a href="http://www.curriki.org/xwiki/bin/view/Coll_Athabasca/NorthernLightsNorthernSkies%2DAstronomy230?bc=Coll_Athabasca.Default">Athabasca University Astronomy 230: Northern Lights, Northern Skies</a> course. In this lesson, you will learn how to identify what causes days and years, how to describe the structure and reasons for time zones, and how to describe what causes the seasons.
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