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Измерване на обиколката на Земята

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Въртене на Слънцето

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Kreisbewegung (Rotation der Sonne) - Stundenbild (Guided Research Model)

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Maan ympäryksen mittaus

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Tutkimus auringonpilkkujen vaihtelusta

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Auringon Pilkut

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Measurement of the Earth Circumferance

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Μέτρηση της περιφέρειας της Γης

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Messung des Erdumfangs mit der Methode von Eratosthenes - Stundenbild (Guided Research Model)

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Hur kan man beräkna jordens omkrets med Eratosthenes metod?

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