It will be noticed that n cannot be exactly the same in all these equations; but if n is the same in (69) and (74) y/x = tan n, so that n is the inclination of the chord of the arc of the trajectory, as in Niven's method of calculating trajectories (Proc. R. [Please select]
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Also Landsberg (1948) has pointed out the close correspondence between the routes of certain long-distance migrants and prevailing wind trajectories. [Please select]
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The planets are moving on closed trajectories in space. [Please select]
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