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Re: Cheap longitude
From: Alexandre Eremenko
Date: 2025 Dec 20, 01:36 +0000

Reminds me the idea of Bris "sextant". But Bris is much more portable, and has multiple pre-set altitudes. Here is one from my collection (next to a Friberger compass):

https://www.math.purdue.edu/~eremenko/Navigation/Instrs/bris-frei.jpg

The whole collection can be seen here:

https://www.math.purdue.edu/~eremenko/Instruments.html

Alex.

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