# 2 Pi Watch

## The Life of Pi for a mathematician

Inventing time in a circular world

Euler was the first person to use Radians in trigonometry. The circumference of a circle is 2 Pi, and Euler defined 360 degrees (of a circle) to be 2 Pi Radians. For the watch above, consider 0 (or 360 degrees) as the “horizontal plane”, represented by Pi and 2 Pi; with the vertical “90 degrees” point being Pi/2, and 270 degrees of the circle representing 3/2 Pi.  Clear as mud?

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