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From: Frank Krygowski <frkrygow@sbcglobal.net>
Newsgroups: rec.bicycles.tech
Subject: Re: Ove Interest?
Date: Thu, 27 Feb 2025 23:21:15 -0500
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On 2/27/2025 8:19 PM, John B. wrote:
> On Thu, 27 Feb 2025 20:32:10 GMT, cyclintom <cyclintom@yahoo.com>
> wrote:
> 
>> On Thu Feb 27 09:39:54 2025 Jeff Liebermann  wrote:
>>>
>>> Tom claimed to "have an engineering degree" several times.  However,
>>> there's no indication if the degree or diploma he claims to have were
>>> the result of a college education, diploma mill, downloaded from the
>>> interent, or a product of his amazing imagination.
>>>
>>> Degree in navigation and Chabot College in Hayward
>>> 02/09/2021
>>> <https://groups.google.com/g/rec.bicycles.tech/c/_Y1MbXuzvNo/m/o6omSxsfAgAJ>
>>> "general education - Degree in navigation
>>> Tality requested I get a BA so that they could promote me to
>>> department manager
>>> Chabot College - Hayward, CA"
>>>
>>> 08/31/2023
>>> <https://groups.google.com/g/rec.bicycles.tech/c/UlnAtHIZnTg/m/-0rUba4qAgAJ>
>>> "Sailing down the coast I had a sexton ...   It was advantageous to be
>>> able to use the Sexton to tell how far we were off of the coast..."
>>> It's a sextant, not a sexton.
> 
> Interested how a Sexton (sextant) measure distance from the coast as
> it only measures angles :-)

ISTM that if one were dealing with a coast that ran east-west and had a 
decent chart, you could use a sextant to find that distance. Finding 
one's latitude was probably the prime reason sextants were invented. 
Once you knew your latitude and that of the coast, the distance is easy 
to find. Ask your buddy who claimed to do a lot of sailing.

Knowing one's Longitude - or finding your distance away from a 
north-south or other coast - is a different matter. It's a nearly 
impossible problem without knowing the precise time, which is why huge 
prizes were offered to entice development of accurate chronometers.

But if your chart showed the precise locations of two different objects 
(e.g. towers) that could be sighted through a sextant, ISTM you could 
observe the horizontal angle between them and do some trigonometry to 
find your position. That's just a geometry or trig problem.

-- 
- Frank Krygowski