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5not sure what you mean by "direct path to their destinations". In spaceflight there are no straight line trajectories. You are leaving a point/planet/station that is moving on an orbit around the sun (or around a planet that is orbiting the sun) and then driving to a moving target so you aim to where your destination will eventually be on its orbit. Between speeding up and slowing down, initial orbital angular velocity and resulting orbital angular velocity, a curving path results. This is very computation intensive and handled buy the ship's nav computer.– BradVCommented May 22, 2023 at 2:07
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If the Sun is in the way of what you are traveling to... maybe you go above or below the plane of the ecliptic if you really have to. Otherwise, you'd just slide to one side or the other of the Sun and curl back.– BradVCommented May 22, 2023 at 2:13
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@BradV You are making my point for me in your comments. The books mention none of this. In the books it always appears that the planets are in close alignment. There never appears to be mention of traveling to the other side of the system or around the sun.– SDHCommented May 22, 2023 at 4:08
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4Are you thinking of the Sun as some sort of giant obstacle you have to maneuver around to reach destinations on the other side? The Sun is quite tiny relative to interplanetary distances - the odds of it being directly in the way are very low.– user2357112Commented May 22, 2023 at 14:34
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5@user2357112 this is a super point to make... relative to the huge emptiness of the solar system the Sun only 'gets in the way' if your absolute optimum trajectory makes it so. As a side issue, how close your spacecraft can safely get to Sun's heat/radiation figures into it. Its not just about gravity effects of physical obstruction.– BradVCommented May 22, 2023 at 15:57
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