Special relativity is one of the monumental achievements of physics of the 20th Century. Whereas Einstein used a coordinate based approach [1], which obscures important geometric aspects of this fundamental theory, many coordinate free geometric languages have since been developed. In [2], D. Hestenes showed how the ideas of special relativity can be elegantly expressed in space-time algebra. T...

The Global Positioning System (GPS) provides a superb opportunity to introduce relativity concepts to undergraduate students, including non-physics majors. Familiarity with the numerous applications of GPS motivates students to understand relativity. A few fundamental principles need to be introduced, including the postulates of special relativity and the universality of free fall. Then a serie...