eclipse

float x, y, org_x, org_y;
float theta, diam_sun, orbit_moon, diam_moon, radius;
color bg = #100315;
color f = #FCFCFC;

void setup() {
  size(500, 500);
  background(bg);
  noStroke();

  org_x = width/2;
  org_y = height/2;

  diam_sun = 150;
  diam_moon = diam_sun*.95;
  orbit_moon = diam_sun - diam_moon ;

  radius = orbit_moon/2 + 3;
}

void draw() {
  background(bg);
  fill(f);
  ellipse(org_x, org_y, diam_sun, diam_sun);
  fill(bg);

  x = org_x + sin(theta)*radius;
  y = org_y + cos(theta)*radius;

  ellipse(x, y, diam_moon, diam_moon);

  theta += 0.0523;

  if (frameCount % 4 == 0 && frameCount <121) saveFrame("image-####.gif");

}