OLIVER BYRNE., — A Short Practical Treatise on Spherical Trigonometry.

Sacred Science Institute, 2006. 4to - over 9¾ - 12" tall, Hardcover, Hard Cover Maroon Suede Guilt, No Jacket, New. ¶ Exact Facsimile Reprint of Original Edition Published:1831. Containing A Few Simple Rules By Which The Great Difficulties To Be Encountered In This Branch Of Mathematics Are Effectually Obviated. Contents: Primum Mobile; Ancient Astronomy; Simple Theorems Of Spherical Trigonometry; Right-Angled Spherical Trigonometry; Pentagram Star Comprised Of 3 Triangles; Simple Formula For Solving All Problems Of Spherical Trig.; Solutions Of Right Triangles; 47th Problem Of Euclid; Pythagorean Theorem; Spherical Triangles; Of Oblique-Angled Spherical Triangle Trigonometry; Correlating The Pentagram Formula To The Fingers Of The Hand. Pentagonal Symmetries; An Important Work Showing A Correlative System Of Sacred Geometric Symbolism And Its Relations To Mathematics & Astronomy.