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what changed?
Hi all, I have been wandering through old astronomy books (circa 1850 - 1912) and have noticed that the older ones describe star colour with different colours than are now used. Green, purple and magenta being three of the colours used more frequently then than now.
Just wondering if this would have to do with the materials and techniques used in mirrors back then? Perhaps light and dust pollution in our 'modern skies'.
Or perhaps a combination of the above plus changes in the English language.
Brian
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