On Fri, Jul 30, 2010 at 1:49 AM, PeterO <rebyl_kayak_at_energysustained.com>wrote: > > ............It looks as if Cook might have used a process such as > recalibrating his clock for local time every day against sunrise, sunset > and > noon. The clock would then only have to remain within spec for 24 hours AND > MEASURE LOCAL TIME and not for months or years to maintain synchronism with > Greenwich. Presumably there were enough stars visible in both the southern > and northern hemispheres so that Cook in Australia could use the tables > developed at Greenwich TO TRY OUT THE LUNAR METHOD........... > > Thinking this over, the ancient Pacific navigators could have used very much the same system using a sand-clock calibrated for 24 hours. Accuracy would not have been so great but then they would at least have had some measure of local time. Craig *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Fri Jul 30 2010 - 09:20:29 PDT
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