How to place the ball position properly in Wheel game?

Question

I have a static number of slots for the number in the wheel game. Start from number 00 to number 1 (clockwise). The position count is 0 to 37 in my Collection array. Currently, I successful place the ball position in the middle of the number with 1 degree. But I unable to calculate a correct value for each of the position when I tried to pass in the number position.

I already tried messing with the calculation, it either the ball sit in the middle between the number or out of range!

    public class WheelDisplay extends JPanel implements ConstantVariable {

    private Image image;
    private ImageObserver imageObserver;
    private float degrees = 1;
    private int post = 0;

    public WheelDisplay() {
        ImageIcon icon = new ImageIcon(IMAGE_LOCATION);
        image = icon.getImage();
        imageObserver = icon.getImageObserver();
    }

    /** Credit to stackoverflow forum : https://stackoverflow.com/questions/25923480/simple-circle-rotation-simulate-motion **/
    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();

        int circleDiameter = Math.min(getWidth(), getHeight());
        double circleRadius = circleDiameter / 2;
        int offSetX = (getWidth() - circleDiameter) / 2;
        int offSetY = (getHeight() - circleDiameter) / 2;

        g2d.drawImage(image, offSetX, offSetY, circleDiameter, circleDiameter, imageObserver);

        g2d.setColor(Color.BLUE);
        int ballDiameter = (int) (circleDiameter * 0.02);
        int ballRadius =  ballDiameter / 2;

        Point p = getPointOnCircle(this.degrees, circleRadius * 0.9, circleRadius);

        int valueX = offSetX + p.x - ballRadius;
        int valueY = offSetY + p.y - ballRadius;
        g2d.fillOval(valueX, valueY, ballDiameter, ballDiameter);

        g2d.dispose();
    }

    private Point getPointOnCircle(float degress, double circleRadius, double innerCircleRadius) {

        //The calculation that allow ball sit in the middle of each number when spin
        double rads =  ((Math.PI  * degress) / 38);

        // Calculate the outter point of the line
        int xCordinate = Math.round((float) (innerCircleRadius + Math.cos(rads) * circleRadius));
        int yCordinate = Math.round((float) (innerCircleRadius + Math.sin(rads) * circleRadius));

        return new Point(xCordinate, yCordinate);
    }

    public void setDegree(int x) {
        this.degrees += 2;
        this.post = x; // The number of position coming from Collection (0-37)
    }
}

The ball supposes to sit in the middle of each 38 numbers in the wheel image.

Hope that someone can point out which part I'm doing wrong!

The image that I'm using is this.