The loxodrome and two projections of the sphere 
Bibliography
[1] RANDLES, W. G. L. - Pedro Nunes e a Descoberta da Curva Loxodrómica, ou como, no século dezasseis, a navegação com o globo não resolveu as dificuldades resultantes do uso de cartas planas. Gazeta de Matemática, n.º 143, July 2002, pp. 90 - 97. Translation by Suzana Metello de Nápoles, reviewed by João Filipe Queiró, Henrique Leitão and by the author of Pedro Nunes and the discovery of the loxodromic curve, or how, in the sixteenth century, navigating with a globe had failed to solve the difficulties encountered with the plane chart, Revista da Universidade de Coimbra, Vol. XXXV, 1989, pp. 119-130.
