If you measured degrees with a full sweep of 120 instead of 360 it would line up with the numbers on a clock. To translate a clock number to degrees with a 120 degree circle just multiply by 10.
I suppose all I have to do with a 360 degree circle is multiply the clock number by 30.
Perhaps it's just easier to have 90 degrees for each quadrant. 90 is a nice round number.
And people like round numbers, like 100 for each quadrant. So they made up gradians (or gon) which is 400 degrees making a circle.
Units. They can make your head spin. 360 degree spin, that is.
http://en.wikipedia.org/wiki/Degree_%28angle%29
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