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So at first I thought that was a strange definition, passing through
antipodes. But then I thought of some closed path (ie the track of a
journey that starts and finishes in the same place). Now consider the
path of the antipodes.  The criteria is simply that these two paths
must intersect.  It is certainly much easier to explain than mine and
nice and easy to check.  I wonder if navigators circumnavigating by
these rules celebrate the first time they cross the antipode of their
path?

Bill


On Mon, 1 Feb 2021 at 14:17, Bob Crawley  wrote:
>
> Thank you Bill, I should have thought to look there. Your definition does 
the job although the average sailor may struggle with it. I then found, on 
adventurestats.com
>
> A true circumnavigation of the Earth (around the world) must:
>
> Start and finish at the same point, traveling in one general direction
> Reach two antipodes*
>
> If they just added a liitle waypoint at Fastnet Rock on the way out and 
ensured that they went south of 52S 170E that would fix it.
>
> Thanks again
>
> BobC
>
> 

   

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