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A bit of clarification, I think the orbiters are in sight of Earth for most of the day.

It is Curiosity that is not in sight of the Orbiters, again because of their low orbit.

I'm not sure I understand. Gale Crater is pretty near the equator, so any equatorial satellite would pass quickly over it, but many many times per day.

You answered your own question: both satellites are in polar orbits. They pass the equator many times a day, but at a different longitude each time.

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