After the introduction of the squared grid, obliquity was probably controlled by reference to grid intersections.
There is no valid reason for supposing that the irrational numbers π and φ were implicated, except coincidentally, in the inclination of pyramids or in the obliquity of slanting lines.
The Navy was found under the authority of George Washington in 1775 as a means to disrupt British Supply ships.
For decades to follow their necessity was a question in terms of being a financially sound investment, even after their successful engagement during the American Revolution.
It covers pretty much every aspect of this field, from calibration to construction.