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Besant's Dynamics

Nature volume 49, pages 146147 | Download Citation



THIS popular text-book has now reached a second edition, and contains several additions which have increased its size from 334 to 448 pages. A new chapter has been added on disturbed elliptic motion, which shows how the elements of an elliptic orbit are affected by small disturbances in the same plane. This chapter will serve as a useful introduction to the planetary theory, since the limitation of the problem to two-dimensional motion enables various difficulties, which arise from taking into account the longitude of the node and the inclination of the orbit, to be got rid of. The principle, upon which the method of the variation of the elements is based, is one to which students should be introduced at an early stage; but unless some simplification is made, the analysis becomes rather complicated. We are inclined to suggest that this chapter might be extended in a future edition.

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