Rhumb Lines and Spirals


Main executable for Windows (zip)


Source code

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It was created by the CENTRO DE MATEMÁTICA E APLICAÇÕES FUNDAMENTAIS of the University of Lisbon, Portugal. The team was composed by Bruno Almeida, Carlos Albuquerque, Rui Lourenço, Sara Rodrigues and José Francisco Rodrigues, who directed the development of the original concept.


This interactive module illustrates, in a historical context, the rhumb lines on the Earth and the spirals that correspond to a remarkable family of their projections in the plane.

The HOME contains the center of interaction with all the contents, which consist of two chapters, one concerning loxodromes on the globe, the other one spirals. Each chapter has a descriptive introduction leading to two applets. Each page is easily open from the HOME