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- Xref: sparky alt.folklore.urban:32170 sci.skeptic:21730
- Path: sparky!uunet!stanford.edu!rutgers!cmcl2!panix!carlf
- From: carlf@panix.com (Carl Fink)
- Newsgroups: alt.folklore.urban,sci.skeptic
- Subject: Re: Wwy is the sky blue? (was Re: Daytime Stars - Not Donahue or Oprah)
- Message-ID: <1992Dec27.190955.15090@panix.com>
- Date: 27 Dec 92 19:09:55 GMT
- References: <2934047046.4.p00168@psilink.com> <1hk42sINN34t@gap.caltech.edu>
- Organization: PANIX Public Access Unix, NYC
- Lines: 25
-
- In <1hk42sINN34t@gap.caltech.edu> carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick) writes:
-
- >In article <2934047046.4.p00168@psilink.com>, p00168@psilink.com (James F. Tims) writes:
- >>I can't figure out whether the atmosphere is a lens or a radiator;
-
- >It's both. At sunrise or sunset, the sun will appear to be somewhat squashed.
- >This is a result of the atmosphere acting as a lens. On the other hand, try
- >the following experiment: Wait until about an hour before sunset. Look at the
- >eastern sky. Blue isn't it? Well, there's no way in hell that the atmosphere
- >is enough of a lens to somehow refract the sun's rays through more than 150
- >degrees. When you see a blue sky to the east near sunset, you're talking about
- >radiation (glowing, to use your term).
-
- [sig deleted]
-
- Um, no. Actually you're seeing neither radiated nor refracted light.
- You're seeing *scattered* light. The light travels in a straight-line path
- to the air over your Eastern horizon, then encounters some dust particles
- and is reflected back into your eye.
-
- --
- Carl Fink carlf@panix.com, C.FINK4(GEnie), or CF427620I@LIUVAX.BITNET
- "Facts are stubborn things; and whatever may be our wishes, our
- inclinations, or the dictates of our passions, they cannot alter
- the state of facts and evidence" -- John Adams
-