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30 Mar 07

Photography as a means to poetry

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09 Sep 06

Print Story - canada.com network

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blue is sky the why

So the sky is violet,not blue as we have always believed.Nevertheless my sky remains blue,the poet's sky,the logician's sky,the cinematographer's sky! - adukuri on 2006-07-25

The resolution of the mystery lies in our daytime vision, which happens to be eight times less sensitive to violet than to blue light.
If Tyndall and Rayleigh are right, then the violet wavelengths from the sun, having still shorter wavelengths than blue, should be scattered even more. Given this, shouldn't the sky be violet, not blue?
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- As you gaze at the clear blue sky, then, you are beholding unambiguous evidence that atoms really exist, something that was widely questioned as recently as the 19th century. This presents a profound but simple answer to our opening question about the sky's colour.
- He noted the distinct blue of smoke and also the progressively deeper blue of distant mountains, the "aerial perspective" often used in the backgrounds of his paintings. He climbed Monte Rosa and speculated that its blue skies were due to "minute, imperceptible particles" suspended in the air like a fine smoke.
- These writings reached the West, where the 12th century monk Ristoro d'Arezzo connected sky blue with the way skilled painters can make the appearance of pale blue by delicately washing pure black pigment over white.
- Plato speculated that the sky's colour emerged from the interaction of the air with the celestial darkness beyond.
- In 1873, James Clerk Maxwell realized the truth: The scattering substance must
  be the molecules of air themselves, none other. Indeed, John Ruskin suggested in
  1869 that sky blue comes from light "reflected from the divided air itself."
  Lord Rayleigh followed Maxwell's advice and calculated that the observed
  scattering of skylight requires molecules whose size accords with that indicated
  by other physical arguments.

10 Aug 06

Bad Astronomy Blog » My mother, the alien

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jagannath rao adukuri's Library tagged the → View Popular

Photography as a means to poetry

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Bad Astronomy Blog » My mother, the alien

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