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Nadir for a craft orbiting the Earth would be radially in, is nadir always pointed towards the Earth or is it pointed towards the celestial body that the craft is orbiting?

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Nadir is always pointed down to the object below. In more rigorous terms the nadir at a given point is the local vertical direction pointing in the direction of the force of gravity at that location. (see for example Wikipedia , Merriam Webster)

For a satellite orbiting the moon, the nadir vector would point at the moon surface. For a satellite orbiting Mars it would point at the Mars surface.

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  • $\begingroup$ @uhoh ok, added some sources $\endgroup$ – NvdP Jul 2 '18 at 5:05

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