Pier du Sud est capitaine de voilier, marin et instructeur de voile. Il rédige des textes sur la voile, la navigation et les voyages en mer.
Celestial navigation

What is the sine of one degree?

Prior to the invention of computers, calculators, or even sliding rules, having what is known as a « sine table » was however of critical importance.

How did we find those values?

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Au Large

Here is a great video from la Fabrique Culturelle on sailboat production in Québec (french only). We can see Jean-du-Sud for a few seconds.