Maapallon pyörimisen toteaminen aistihavainnoin

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Miksi vuodenajat pysyvät paikoillaan vai pysyvätkö ne?

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Mondbeobachtung - Stundenbild (The 5E Instructional Model)

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Newton's Fehler und die Lichtgeschwindigkeit im Wasser - Stundenbild (Guided Research Model)

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Sonnenflecken - Stundenbild (Guided Research Model)

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The Two Systems

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Tutkimus auringonpilkkujen vaihtelusta

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Untersuchung von Mondkratern - Stundenbild (Guided Research Model)

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Ανοικτά σμήνη αστέρων

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Άρης

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