21. The term 'syzygy' is referred to when the ________
22. The Solar eclipse achieves totality only in limited geographical regions because ________
23. The largest amount of reflection of the solar radiant energy which is reflected back into space before reaching the earth's surface is due to ________
24. We always see the same surface of the Moon because
25. Which of the following phenomenon gives an evidence for the spherical shape of the earth?
26. When the Earth is at the maximum distance from the Sun, it is called
27. In how much time, Earth rotates once on its axis?
28. The Earth is tilted on its axis
29. The earth's annual circuit round the sun covers a distance of ________
30. The mean radius of the earth is approximately ________
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