NAVIGATION — CANOES TO SPACESHIPS — DRAPER 317 



the sun line of sight and a planet line of sight is used to determine 

 the location of the vehicle along the line of intersection of the two 

 cones. 



CONCLUSION 



Navigation has been discussed in general terms, with emphasis on 

 the geometrical aspects of the problems involved. Radiation contacts 

 with terrestrial and celestial points provide means for navigation 

 under ordinary circumstances. In the special situations that arise 

 when radiation contacts are not feasible, inertial methods are avail- 

 able. Practical applications of these methods are too new for details 

 of equipments to be settled, but it is certain that navigation of the 

 future will employ many different arrangements, ranging from all- 

 radiation-contact systems to all-inertial systems with various compro- 

 mise arrangements in between. We can look forward with confidence 

 to rapid and interesting developments in the old art of navigation. 



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