SOURCE

let a = 0
let x = 0
let y = 0
let r = 100
function setup(){
    createCanvas(300,300)
    smooth()
    noFill()
}
function draw(){
    background(255,20)
    a++
    x=r*cos(radians(a))+150
    y=r*sin(radians(a))+150
    ellipse(x,y,30,30)
}