<svg viewBox="0 0 160 160" width="160" height="160">
  <circle cx="80" cy="80" r="50" />
  <g transform=" matrix(0.866, -0.5, 0.25, 0.433, 80, 80)">
    <path d="M 0,70 A 65,70 0 0,0 65,0 5,5 0 0,1 75,0 75,70 0 0,1 0,70Z" fill="#FFF">
      <animateTransform attributeName="transform" type="rotate" from="360 0 0" to="0 0 0" dur="1s" repeatCount="indefinite" />
    </path>
  </g>
  <path d="M 50,0 A 50,50 0 0,0 -50,0Z" transform="matrix(0.866, -0.5, 0.5, 0.866, 80, 80)" />
</svg>

* {
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

body {
  background: #FC0;
}

svg {
  position: fixed;
  top: 20%;
  height: 60%;
  left: 20%;
  width: 60%;
}