more than 2 didactic hours


Open Clusters

4.5
Average: 4.5 (4 votes)
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Άρης

4.5
Average: 4.5 (2 votes)
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Mars

4.666665
Average: 4.7 (6 votes)
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Αστερισμοί

4.5
Average: 4.5 (2 votes)
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Constellations

4.5
Average: 4.5 (4 votes)
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Ο γαλαξίας της Ανδρομέδας (Μ31)

4
Average: 4 (3 votes)
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Andromeda (M31) galaxy

4.5
Average: 4.5 (4 votes)
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Τα δυο συστήματα συντεταγμένων

4.666665
Average: 4.7 (3 votes)
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TheTwo Coordinate Systems

4.5
Average: 4.5 (4 votes)
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Σύστημα Σφαιρικών Συντεταγμένων

4
Average: 4 (3 votes)
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