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Mars is 1.52 AU from the sun, or 1.52x further than Earth, so the inverse square law says 43% less sun power. But the atmosphere is thinner and a different composition.
To know how the human eye actually operates on Mars, one would have to get a human eye to Mars.
I wonder if a human could even properly make sense of the difference after spending so long on a ship between the planets. Plenty of time to adjust
Depends entirely on the ship's lighting.
I guess I meant more about how well you'd actually remember the brightness on earth after being on route so long rather than your eyes physically adjusting