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Discussion in 'Redox Rx' started by Jack Kruse, May 5, 2018.

  1. WalterNL

    WalterNL New Member

    Neil Taylor likes this.
  2. Billybats

    Billybats New Member

    Hi Walter,
    Niiiiccccceeee link. I found this one interesting., its called skin, light and beauty.
    WalterNL likes this.
  3. JanSz

    JanSz Gold

    sorry, it would be best is Jack clarified what he meant

    The discussion is not about ratio
    transition (UVA IRA transition) (whatever that means)
    (the morning transition)
    as written by @Jack Kruse

    I think it may possibly help to define sunlight and sunset, first.
    I was trying to do that here:
    WalterNL likes this.
  4. JanSz

    JanSz Gold

    Per chart from post #12
    UVA shows up right away,
    and does that gradually
    without step change (that could be called some kind of name)
  5. You are assuming sunrise is at 8am and sunset at 6pm
    drezy and Lahelada like this.
  6. JanSz

    JanSz Gold

    Indeed we could use better chart.

    5:55 AM
    Saturday, August 1, 2009 (GMT+8)
    Sunrise in Hong Kong
    6:27 AM
    Saturday, October 31, 2009 (GMT+8)
    Sunrise in Hong Kong
    Last edited: May 15, 2018
  7. drezy

    drezy Gold

    Anita likes this.
  8. WalterNL

    WalterNL New Member

    I agree it's best to have clarification from Dr. Kruse.

    I'm only thinking out loud. IR-A has longer waves than visible light. UV-A has shorter waves than visible light. Given that they need to travel a longer distance at sunrise/sunset, the shorter wavelengths scatter to a higher degree than the longer wavelength radiation. Sunrise appears red and orange because they have longer wavelengths. So however long the transition is for a certain zipcode and season, IR should hit Earth's surface first, then visible (red, orange, yellow, green, blue, violet), then UV.
    Anita and JanSz like this.
  9. JanSz

    JanSz Gold

    Now we have, what looks like, good attempt at the answer to the posed question.
    Thank you.
    Standing on the Eastern beach,
    there is a daylight long before we see first part of sun's disc (dawn).
    How that light affects us?
    What frequency content it contains?

    Anita likes this.
  10. JanSz

    JanSz Gold


    So it looks like the
    Transition when we see IRA only and UVA is still absent
    is (definitely) when we see red sun.
    And for little bit longer, minutes, when sun gets brighter.

    Not sure how to classify the time before we see first ray of sun's disk.
    But that light, likely also affects our pineal gland.

    Anita and WalterNL like this.
  11. WalterNL

    WalterNL New Member

    The odd thing is that we can see sunlight before it breaks the horizon. The actual sunrise is also before the sun breaks the horizon due to atmospheric refraction, where the rays don't follow a straight path.


    There's also something interesting here: https://en.wikipedia.org/wiki/Blue_hour
    Apparently there is a small time window before sunrise, where the sky appears blue because those short wavelengths scatter in the atmosphere, while long red rays go through the atmosphere into space. So there's a definite relevance of the angle of sunlight that make the difference whether certain rays reach Earth's surface or not.
    Anita and JanSz like this.
  12. JanSz

    JanSz Gold

    I always gain interacting with @WalterNL

    Picture like above begs question.
    How much time (minutes, seconds) it takes to cover 6, 12, 18 degrees when laying on the beach (eyes at zero elevation) at the:
    (tropic of Cancer)
    30, 40, 50 degrees North

    Anita likes this.
  13. drezy

    drezy Gold

    That's going to depend on the other angle -- the azimuth
  14. JanSz

    JanSz Gold

    Keep going.
    Likely good idea to use solar time.
    Otherwise two guys, on both ends of the same time zone, will start arguing about azimuths.

    Last edited: May 16, 2018
  15. drezy

    drezy Gold

    WalterNL likes this.
  16. JanSz

    JanSz Gold

  17. Phosphene

    Phosphene Gold (finally)


    What a spectacular Scrabble word.

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