# Junior Knights Student
# 11/16/2013

import turtle

def main():
    
    turtle.speed(0)

    # Bullseye is in concentric circles of 10 pixels.
    for i in range(10,210,10):

        # First move to the correct spot on the negative x-axis.
        turtle.penup()
        turtle.setpos(0,-(210-i))
        turtle.pendown()

        # Set our fill collor in a pattern with just red and green.
        turtle.fillcolor((0.2+i/300.0,.5-i/400.0,0))

        # Fill and draw a circle!
        turtle.begin_fill()
        turtle.circle(210-i)
        turtle.end_fill()

main()
