使用CSS旋转行星

<div class="container">
  <div class="sun"></div>
  <div class="planet"></div>
</div>

.container {
  position: relative;
  width: 200px;
  height: 200px;
}

.sun {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 50px;
  height: 50px;
  background-color: yellow;
  border-radius: 50%;
}

.planet {
  position: absolute;
  top: 0;
  left: 50%;
  transform-origin: top center;
  width: 20px;
  height: 20px;
  background-color: blue;
  border-radius: 50%;
}

.planet {
  animation: rotate 5s linear infinite;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}