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- Path: sparky!uunet!wupost!spool.mu.edu!olivea!gossip.pyramid.com!pyramid!infmx!news
- From: robertw@informix.com (Robert Weinberg)
- Newsgroups: rec.puzzles
- Subject: Re: Direction of the sun
- Message-ID: <1992Dec29.164022.2651@informix.com>
- Date: 29 Dec 92 16:40:22 GMT
- References: <1992Dec24.012636.17115@Csli.Stanford.EDU>
- Sender: news@informix.com (Usenet News)
- Organization: Informix Software, Inc.
- Lines: 42
-
- In article <1992Dec24.012636.17115@Csli.Stanford.EDU> hiraga@Csli.Stanford.EDU
- (Yuzuru Hiraga) writes:
- >
- > # Heard from a Japanese colleague -- Sorry again if this is in the FAQL
- >
- > Two boys, A and B, are watching the sunset.
- > A points to the sun and says:
- > "This is the direction where the sun is right now."
- > B replies:
- > "But don't you know that the rays take over 8 minutes to reach the Earth?
- > The sun is actually already below the horizon."
- > Which is correct? Why? (Make it understandable to a ten year-old.)
-
- This seems to be a question about reality versus observable reality - a question
- which can be asked about any distant object. We see it, we know that something
- happened in "reality" while the light reached us. For instance, as we read this,
- the Sun may "already" have exploded but we won't know about "the event" for another
- 8 minutes.
-
- I'm sure (:>) the physicists out there will tell us is no way that we will be aware
- of any consequences due to the explosion until the 8 minutes have passed - even if,
- say, a Sun-orbiting satellite has "already" been vaporized and has stopped sending
- telemetry.
-
- It is not at all different from the question of the 5 blind men observing different
- parts of the elephant and constructing different "realities" of the "actual"
- elephant that is beyond their observation.
-
- Mr. Hiraga's question "simply" highlights the uneasiness of relying on observation
- while realizing that observation is simultaneously referential. This goes on all
- the time. Tree falling in the woods but nobody hears it, Ronnie is really being
- manipulated by Nancy, etc.
-
- > (Make it understandable to a ten year-old.)
- Lots of luck! How about, "remember that Christmas present that you didn't get?"
-
- --
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