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Измерване на обиколката на Земята

0
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Въртене на Слънцето

4
Average: 4 (1 vote)
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Слънчеви цикли

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Марс - една "жива" планета?

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Изследване на лунни кратери

4
Average: 4 (2 votes)
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Kreisbewegung (Rotation der Sonne) - Stundenbild (Guided Research Model)

4
Average: 4 (1 vote)
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Maan ympäryksen mittaus

4
Average: 4 (1 vote)
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Kuun kraaterit

4
Average: 4 (1 vote)
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Tutkimus auringonpilkkujen vaihtelusta

4.5
Average: 4.5 (2 votes)
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Auringon Pilkut

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