let a=500;
let r=200;
let x=320;
let y=120;
function setup() {
createCanvas(900,900);
}
function draw() {
a+=50;
noStroke()
fill(random(500),random(300),random(700));
r=random(100,200)
x=cos(radians(a))*r+300;
y=sin(radians(a))*r+300;
ellipse(x,y,200,200);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>