| 21. | Librations of the Moon periodically allowed limited glimpses of features near the lunar limb on the far side.
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| 22. | Between 6 March and 6 April 1961 he succeeded in photographing two bright patches near the libration point.
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| 23. | This part of the surface is sometimes brought into sight of observers on the Earth due to libration.
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| 24. | The second category of works identified by L�thi centres on the theme of libration from the lovelessly predetermined image.
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| 25. | His broad range of minor planet research included problems from mass determination to asteroid missions and from libration to depletion.
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| 26. | In addition, this crater can sometimes become hidden from sight due to libration of the Moon in its orbit.
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| 27. | Lagrange was awarded the 1764 prize of the French Academy of Sciences for his memoir on the libration of the Moon.
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| 28. | This part of the surface is also subject to libration, and the crater can sometimes be completely hidden from view.
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| 29. | This pendulum motion can develop into complex librations in both the in-plane and out-of-plane directions.
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| 30. | The authors were able to show with both analytic and numerical models that certain libration modes are readily excited by turbulence.
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