| 11. | See precession as well as nutation.
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| 12. | It includes librations but no nutations.
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| 13. | Simple nutation occurs in dorsiventral organs, such as flat leaves, both foliage and floral.
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| 14. | Finally, the top can wobble up and down; the inclination angle is the nutation angle.
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| 15. | They are also called nutations, except for the slowest, which is the precession of the equinoxes.
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| 16. | However, the combined effects of precession and nutation will cause the coordinates to change slightly over time.
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| 17. | Changes in temperature cause flowers to open or close by movements which resemble the simple nutation of dorsiventral organs.
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| 18. | Nutation is one of the corrections which must be applied to obtain the apparent place of an astronomical object.
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| 19. | Its axial tilt does undergo nutation; a slight, irregular motion with a main period of 18.6 years.
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| 20. | An example of precession and nutation is the variation over time of the orientation of the axis of rotation of the Earth.
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