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Meaning of isophotal and photometric

  1. Feb 4, 2007 #1
    What do the words "isophotal" and "photometric" mean? I can't find any definitions.
  2. jcsd
  3. Feb 4, 2007 #2
    in astronomy "photometric" basically means the sky is clear and its a perfect observing night
  4. Feb 5, 2007 #3

    Claude Bile

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    Photometric is also a name given to a unit system that incorporates the response of the human eye. Units such as Candelas, Lumens (sp?) etc. fall into this category.

  5. Feb 6, 2007 #4
    Seems to fit with the context. Thanks! Now I only need to know what isophotal means. Photons with the same wavelength?
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