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Really interesting thread and great responses.
As it has been explained before, when looking through the atmosphere, from the ground, as we humans normally do, the same stars will have different colours depending on their declination, so as the Earth rotates, the colours of the stars will change due to atmospheric scattering (as it happens with our Sun; it is yellow/red at sunrise/sunset and whitish/yellowish in the middle of the day). For this very reason, at least how I understand it, it is impossible to represent the colours of the stars that we would perceive with our eyes in one definite way.
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