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Sunset Geometry (2016) (shapeoperator.com)
89 points by niklasbuschmann 17 days ago | hide | past | web | favorite | 5 comments



I found this to be a very gentle introduction to GA, FWIW:

"Geometric Algebra for Electrical and Electronic Engineers"

> This tutorial paper provides a short introduction to geometric algebra, starting with its history and then presenting its benefits and exploring its applications.

> Abstract: In this paper, we explicate the suggested benefits of Clifford's geometric algebra (GA) when applied to the field of electrical engineering. Engineers are always interested in keeping formulas as simple or compact as possible, and we illustrate that geometric algebra does provide such a simplified representation in many cases. We also demonstrate an additional structural check provided by GA for formulas in addition to the usual checking of physical dimensions. Naturally, there is an initial learning curve when applying a new method, but it appears to be worth the effort, as we show significantly simplified formulas, greater intuition, and improved problem solving in many cases.

https://ieeexplore.ieee.org/document/6876131?arnumber=687613...

> By James M. Chappell, Samuel P. Drake, Cameron L. Seidel, Lachlan J. Gunn, Student Member IEEE, Azhar Iqbal, Andrew Allison, and Derek Abbott, Fellow IEEE


This is really cool. It reminds me of a friend of mine measured the rotation rate of the earth using in a way that I thought was pretty neat.

https://nickdrachman.wordpress.com/2019/07/31/measuring-the-...


My Dad tinkered with nautical sextants. He told me the Sun is actually visible after it dips below the horizon due to refraction.


That was my thought - isn't refraction going to mess up the trigonometry involved here? Like in the Bedford Level experiment [1]

[1] https://en.wikipedia.org/wiki/Bedford_Level_experiment


Excellent article. Thanks.




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