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navigation ". which can be divided in three phases:
circuinnavigation of the Earth (parking orbit or departure);
middle or interplanatery navigation;
approach and landing 011 the pia net.
The radio-assistence from the Earth, with transponder, may play the
principal iole for the first two phases, while for the last phase, the astronauta
must rely 011 the self-contained navigation: electronics and observation.
The energy reserve reduce» the general needs of space navigation.
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