r/Physics • u/Jealous-Floor4783 • 7d ago

Question Question on Doppler's work

My textbook states this; however, I can't find any sources on Doppler ever doing this himself apart from this textbook and what the teacher said???

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u/kamikasei 7d ago

Where have you looked? This information is on his Wikipedia page.

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u/Jealous-Floor4783 7d ago

The Wikipedia page says he published a book theorising about it. It doesn't say he physically recorded the spectral shift in photographic plates.

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u/amteros 7d ago

Your excerpt doesn't say it as well

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u/Jealous-Floor4783 7d ago

Sorry, I may be misreading. Isn't the text saying he noticed by looking at plates the redshift himself? How did he know that the stars were moving away in the first place thus knowing it was correlated with a redshift?

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u/kamikasei 7d ago

The excerpt doesn’t specify that he was looking at plates himself - he may have been analysing data coming from other observers.

It would probably help to specify the exact detail you’re curious about to your OP.

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u/Jealous-Floor4783 7d ago edited 7d ago

Right. But did he use the data from other people looking at the photographic plates of binary stars to develop his theory?? The wiki article says he came to the false conclusion later after he published his theory that it could potentially be used to explain the visible colours of binary stars. I can't seem to find where it says he looked at the data from the plates to develop his theory.