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B Definition of unshifted spectral lines?

  1. May 15, 2017 #1
    N00b question :-)
    I have read articles about redshift and blueshift and have a good idea about them. What I would like to know is how you decide if something is "unshifted" - what is the definition of this? is there a standardized way of defining/mapping an element's unshifted spectral lines?
    Hope this makes sense...

  2. jcsd
  3. May 15, 2017 #2


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    You can measure what the absorption lines of e.g. hydrogen are in laboratory conditions. This is your standard of reference.
  4. May 15, 2017 #3
    Thanks for the clarification.
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