# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Mathematical Question
From: Vic Fraenckel
Date: 2002 Sep 19, 21:47 -0400

```Is this not a spherical triangle? Prehaps I misunderstand your description?

Vic
________________________________________________________

Victor Fraenckel - The Windman                 vfraenc1{at}nycap.rr.com
KC2GUI                                                      www.windsway.com

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----- Original Message -----
From: "Robert Eno"
To:
Sent: Thursday, September 19, 2002 9:09 PM
Subject: Re: Mathematical Question

| Ok, let's say that it has a lensatic shape and a circular base. What would
| it be called?
|
| I may have erred in my description. I guess and arc is two dimensional
| whereas it's spherical equivalent would be three dimensional.
|
|
| ----- Original Message -----
| From: Brian Whatcott
| To:
| Sent: Thursday, September 19, 2002 9:02 PM
| Subject: Re: Mathematical Question
|
|
| > At 07:30 PM 9/19/02, you wrote:
| > >Greetings list,
| > >
| > >Given the rather esoteric nature of some of the recent discussions, I
am
| > >hopeful that one of you will have the answer to a long-standing
question
| > >of mine.
| > >
| > >What is the term used to describe a small 2 dimensional section of a
| > >sphere? Or to put it another way, if a small section of a circle is
| called
| > >an "arc", what is the equivalent in a sphere?
| > >
| >
| > A spherical surface may have an irregular perimeter, or be a
| > spherical triangle, or spherical polygon, or a spherical segment of one
| base
| >   according to
| > Math Dictionary, James & James, Van Nostrand.
| >
| >
| >
| > Brian Whatcott
| >    Altus OK                      Eureka!
| >
|

```
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