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- Path: sparky!uunet!gatech!paladin.american.edu!auvm!UIUC.EDU!G-CZIKO
- Message-ID: <199301041800.AA08249@ux1.cso.uiuc.edu>
- Newsgroups: bit.listserv.csg-l
- Date: Mon, 4 Jan 1993 12:00:12 -0600
- Sender: "Control Systems Group Network (CSGnet)" <CSG-L@UIUCVMD.BITNET>
- Comments: Warning -- original Sender: tag was cziko@UX1.CSO.UIUC.EDU
- From: "Gary A. Cziko" <g-cziko@UIUC.EDU>
- Subject: Astronony and Science
- Lines: 44
-
- [from Gary Cziko 930104.1730 GMT] (Damn, I typed "92" again.)
-
- Bill Powers (930104.0900) observes:
-
- >Today, Jan. 4, is the day of latest sunrise; the earliest sunset
- >occurred way back on Dec. 7. We got an elliptical orbit.
-
- Bill, you were more careful last time you made astronomical observations
- when you took into consideration that not everyone on CSGnet lives north of
- the equator.
-
- Let's see if I can figure out how the southern hemispherians see this.
- Since their days are long when ours are in the north are short, today must
- be the day of either the earliest sunrise or latest sunset. To figure out
- which is bit harder.
-
- Since we all use the same terminator (earth shadow line) for sunrise, and
- share the "other" terminator for sunset (the earth spins in the same
- direction no matter where you), I don't see why they should have the
- earliest sunrise while we have our latest. So I can only guess that today
- must be the latest sunset down under.
-
- Avery, am I right?--Gary
-
- P.S. Isn't it interesting how being part of a global community gives a
- different perspective on things. General statements are less likely to be
- true. I suspect that this is how science approaches the truth. The more
- people testing out proposed general theories the more likely the refutation
- of inadequate and the (if only temporary) retention of better ones.
-
- A colleague of mine has school children do science projects on stuff like
- this via e-mail. Things like comparing the shadow length of vertical meter
- stick at local noon on the same day in Fairbanks, New York, and Miami
- provides lots of interesting data for these kids. Isn't this sort of what
- we're doing on CSGnet?--Gary
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- Gary A. Cziko Telephone: 217.333.8527
- Educational Psychology FAX: 217.244.7620
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