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Jan 18, 2019 at 19:47 comment added Bram True... depends on orbital speeds. But it also minimizes the delta-speed if you always graze at outgoing. At "incoming" you could burn up in the atmosphere, whereas in "outgoing" you are more likely to be matched. @DMGregory
Jan 18, 2019 at 17:53 comment added DMGregory This could give unnecessarily long trips. Let's say we're positioned so that the planet is coming toward us and we can actually reach the "incoming" grazing point at the same time the planet does. If we're only looking at the "outgoing" grazing point, then we could end up spending half an extra half a year in transit!
Jan 18, 2019 at 17:19 history answered Bram CC BY-SA 4.0