let vSpeed = -1;

let counter = 0;

​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background('blue');

  fill('yellow');

  ellipse(width / 2, sunY, 100);

  fill('green');

  rect(0, 300, width, 100);

  sunY = sunY + vSpeed;

  //  If 250 frames have passed

  if (counter == 250) {

    //  Stop moving the sun

    vSpeed = 0;

  }

  //  I

  if (counter == 250 + 120) {

    vSpeed = 1;

  }

  if (counter == 250 + 120 + 250) {

    vSpeed = 0;

  }

  if (counter == 740) {

    vSpeed = -1;

    counter = 0;

  }

  counter = counter + 1;

}