In Stranger in a Strange Land, Robert Heinlein claims that travelers to Mars spent 258 days on
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In Stranger in a Strange Land, Robert Heinlein claims that travelers to Mars spent 258 days on the journey out, the same for return, "plus 455 days waiting at Mars while the planets crawled back into positions for the return orbit." Show that travelers would have to wait about 455 days, if both earth-Mars journeys were by Hohmann transfer orbits.
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