15-18


Equatorial coordinates system (Image)

3
Average: 3 (1 vote)
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Earth and Sun (Image)

2
Average: 2 (2 votes)
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Asteroids (Theory)

0
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The Philosophy and Practise of Science

0
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Asteroid period (students activity)

3
Average: 3 (1 vote)
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Parallax Method

4.333335
Average: 4.3 (9 votes)
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Cosmic Velocities

4.642855
Average: 4.6 (14 votes)
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Measurement of the Earth Circumferance

4.625
Average: 4.6 (8 votes)
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Solar Cycles (The Butterfly Diagram)

4.125
Average: 4.1 (8 votes)
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How long does a day last on Jupiter?

4.384615
Average: 4.4 (13 votes)
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