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It will perhaps be wondered at, after so much has been written on this subject, that I should have the temerity to offer my mite to the notice of the public, or to imagine myself capable of throwing any light upon a branch of Mathematics that has been so much illuminated by the works of the learned. I trust, however, that when the reader has heard my explanations, he will not consider that I have engaged in a useless or unprofitable undertaking. Much indeed has been written by learned and experienced Mathematicians, but their works seem rather addressed to the proficient, than to the uninitiated student in the science.
Livre de Lyon
Trigonometry, Phenomena, Spherical Trigonometry, Hypothenuse
Byrne, Oliver, "A Short Practical Treatise on Spherical Trigonometry: Containing a Few Simple Rules, by Which the Great Difficulties to Be Encountered by the Student in this branch of Mathematics Are Effectually" (2020). Science and Mathematical Science. 12.