From: Jason Rogers <jacaetevha@gmail.com>
To: Steve Thomas
<sthomas1@gosargon.com>
Cc: Alan Kay <alan.nemo@yahoo.com>; iaep <iaep@lists.sugarlabs.org>; squeakland <squeakland@squeakland.org>; "naturalmath@googlegroups.com" <naturalmath@googlegroups.com>
Sent: Thursday, September 29, 2011 4:51 AM
Subject: Re: [squeakland] [IAEP] [NaturalMath] KIds from around the world measuring the Circumference of the Earth
Where is the link?
--
Jason Rogers
On Thu, Sep 29, 2011 at 12:40 AM, Steve Thomas <
sthomas1@gosargon.com> wrote:
> Here is a link to Alan's talk, his reference to Eratostenes starts at around
> 51:50.
> Alan, do you still have a copy of the presentation?
> Stephen
>
> On
Thu, Sep 29, 2011 at 12:18 AM, Alan Kay <
alan.nemo@yahoo.com> wrote:
>>
>> But consider a flat Earth and a low small sun directly over the well. This
>> will yield exactly Eratosthenes' result. The key here, which I've never seen
>> mentioned in any books for children, is that the Greeks had to have a very
>> good set of reasons for thinking the Earth round and the sun large enough
>> and far enough away (and they did).
>> I gave a talk on how they did this in the Kyoto Prize lecture followups in
>> San Diego in 2005. Aristarchus was one of several key figures.
>> The shame of it is that for both math and science learning, the important
>> heuristic of trying to identify all the possible cases for a result is never
>> encountered by the children (or most adults) who have
read about
>> Eratosthenes.
>> Cheers,
>> Alan
>>
>> ________________________________
>> From: Steve Thomas <
sthomas1@gosargon.com>
>> To:
naturalmath@googlegroups.com; iaep <
iaep@lists.sugarlabs.org>;
>> squeakland <
squeakland@squeakland.org>
>> Sent: Wednesday, September 28, 2011 9:06 PM
>> Subject: [NaturalMath] KIds from around the world measuring the
>> Circumference of the Earth
>>
>> The Goal of the Noon Day Project is to have students measure
the
>> circumference of the earth using a method that was first used by
>> Eratosthenes over 2000 years ago.
>> Students at various sites around the world will measure shadows cast by a
>> meter stick and compare their results.
>> From this data students will be able to calculate the circumference of the
>> earth. Click here to get to their site and register.
>> Watch the Carl Sagan video, its a treat.
>> Thanks to Ihor Charischak for pointing this out.
>> Stephen
>> --
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>>
>>
>> _______________________________________________
>> IAEP -- It's An Education Project (not a laptop project!)
>>
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