Van Brummelen, Glen. <br/><br/>
Heavenly mathematics  the forgotten art of spherical trigonometry /  [electronic resource] : 
Glen Van Brummelen. 
 - Princeton :  Princeton University Press,  c2013. 
 - xvi, 192 p. :  ill. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/>Heavenly mathematics -- Exploring the sphere -- The ancient approach -- The medieval approach -- The modern approach: right-angled triangles -- The modern approach: oblique triangles -- Areas, angles, and polyhedra -- Stereographic projection -- Navigation. 
<br/><br/><br/>Electronic reproduction. <br/>Palo Alto, Calif. : <br/>ebrary, <br/>2013. <br/>Available via World Wide Web. <br/>Access may be limited to ebrary affiliated libraries. 
<br/><br/><label>ISBN: </label>
<br/><br/><label>LCCN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Spherical trigonometry.<br/>Trigonometry.
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Electronic books.
<br/><br/><label>LC Class. No.: </label>QA535  / .V36 2013eb 
<br/><br/><label>Dewey Class. No.: </label>516.24