I began with changing this function by a horizontal translation. This was done by subtracting a value from my 'x' value. Because I wanted the sun to move on its horizontal axis, what I did was subtract S units from 'x' to make the sun move. On the slider, I set a domain to the variable S so that when I pressed play, the sun would move between 140 and 210 on the x-axis. Then I changed the function's location by a vertical translation, by subtracting an amount form my 'y' value. To make the sun move up the on the y-axis, I subtracted 80 from the 'y' value. All these values were adjusted while also trying to figure out what value best fit for the radius of my circle. Changing the radius affected the function by the horizontal dilation. After that, to fill in the circle, I made r^2 greater than the rest of the values of the function. To make the sun look like it disappears when it goes off frame, what I did was I set a domain on the sun, to make it only visible from certain points along the x-axis.