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- Newsgroups: sci.astro
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- From: lawler@ektools.kodak.com (Ed Lawler)
- Subject: Re: Solstice Question (simple)
- Message-ID: <1992Dec25.170327.4717@pixel.kodak.com>
- Followup-To: lawler@ektools.kodak.com
- Sender: news@pixel.kodak.com
- Organization: Eastman Kodak
- References: <7460063@hpfcso.FC.HP.COM> <1992Dec24.164441.25419@emr1.emr.ca>
- Date: Fri, 25 Dec 92 17:03:27 GMT
- Lines: 23
-
- In article <7460063@hpfcso.FC.HP.COM> goris@hpfcso.FC.HP.COM (Andy Goris) writes:
- >
- >I have a simple question for some astronomy guru out there:
- >
- > As everyone knows, winter solstice is the day with the shortest time
- > between sun-rise and sun-set. However, it is neither the day
- > of latest sun-rise nor earlist sun-set. Why is this? I'm having
-
-
- It has to do with the earth's elliptical orbit as you suspect. Also,
- remember that perihelion does not occur on the winter solstice date.
- Since the speed of the earth is changing because of the elliptical
- orbit the time the sun crosses zenith is changing too. You can
- expect the local sunrise and sunset to change for the same reason.
- It's tough to picture. You might want to try drawing an exaggerated
- elliptical orbit on paper and seeing how much more arc is swung through
- in one day when the earth is nearest the sun than when its furthest
- from the sun.
-
- Good luck,
- Ed
-
-
-