Physicists have used satellite images and mathematical modelling to study narrower wakes associated with fast-moving boats. You can read about this discussion here: https://physicsworld.com/a/physicists-rethink-celebrated-kelvin-wake-pattern-for-ships/
Here's a quick derivation of how we find the 19.47 degree angle: https://personal.math.ubc.ca/~cass/courses/m309-01a/carmen/Mainpage.htm
And as always... if you like this type of content, you'll probably like our lectures on Game Physics:
https://pikuma.com/courses/game-physics-engine-programming