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But how do probes know exactly by how much to reduce their velocity and by how many degrees to deviate to ensure they hit the right position in the Martian atmosphere for precise entry? Most of JPL's interplanetary probes don't "know" where they are. What they do "know" what time it is and where they are pointing. It's combination of people and equipment ...


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How many satellites would be required for Solar System GPS? Let's try six, along the lines of @szulat's comment but a few more. The question says we can ignore planetary shadows for the purposes of this question, so ignoring the need for redundancy for now, let's put six in circular polar heliocentric orbits at say 6 AU and never mind the cost, in two ...


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