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Because this is an astronomy venue, I will close by calling to your attention that the information content in the Fraunhofer lines of starlight is independent of relative motions of source or observer.
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I'm not completely clear what you mean by this...
I'm fond of using the very pronounced double emission lines of sodium as a benchmark, simply because even a rank amateur (me!) can recognize them.
If I see them, I know them. "Oh, wow, hot sodium!"
If I see them, and they're red, I know, "Oh, wow, hot sodium that's moving away from me." If see them, and they're blue, I know, "Oh, wow, hot sodium that's moving toward me."
Is that or is that not "information?"
Silas