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There are some values I cannot know

FélixBachiller
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OhioBob

OhioBob

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1 hour ago, Plusck said:

However from a purist's perspective - how do you know your absolute velocity? The only way to actually know that amounts to knowing your flight path angle.

In real life we would put a transponder on the spacecraft track it via radar.  After taking several position and distance measurements, the spacecraft's movement in 3-dimensional space versus time in known.  From this the orbit can be derived.

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