Наблюдение на звезди и звездни системи

4.285715
Average: 4.3 (7 votes)
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Наблюдение на звездни купове, мъглявини и галактики

4.333335
Average: 4.3 (6 votes)
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Observations of stellar clusters, nebulae and galaxies

3.75
Average: 3.8 (4 votes)
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Astrology and zodiac

4.6
Average: 4.6 (5 votes)
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Астрология и зодиак

3.857145
Average: 3.9 (7 votes)
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How can one observe the Earth’s rotation by sense perception?

4.5
Average: 4.5 (2 votes)
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Black body Radiation

4
Average: 4 (5 votes)
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Gravitation and Weightlessness

4
Average: 4 (5 votes)
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Observations of the Moon and exploring the lunar surface or "Guide for lunar travelers"

4.333335
Average: 4.3 (6 votes)
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Optical investigation made with a cell phone

3.5
Average: 3.5 (2 votes)
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