codepens/daylight-cycles-of-earth/dist/style.css

body {
  margin: 0;
  color: #fff;
  font-size: 16px;
  font-family: "Times New Roman";
  font-weight: 100;
  font-style: italic;
  background: #222;
}

h1 {
  margin-top: 5vh;
  color: #fff;
  text-align: center;
  font-size: 32px;
  font-style: normal;
  font-weight: 100;
  letter-spacing: 2px;
}
h1 i {
  font-size: 14px;
  vertical-align: 35%;
}
h1 b {
  font-family: Helvetica;
}
h1 span {
  display: inline-block;
  border-bottom: 1px solid #fff8;
  height: 33px;
  padding: 0 6px;
}

.earth-container {
  position: relative;
  margin: 80px 0 120px calc(50% - 190px);
  height: 380px;
  background: linear-gradient(90deg, #222 190px, #0000 190px), linear-gradient(#0000 0, #111 0.5%, #111 98.5%, #0000 100%);
  cursor: pointer;
}
@keyframes rotate {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 950px 0;
  }
}
.earth-container .globe {
  position: absolute;
  width: 380px;
  height: 100%;
  border-radius: 100%;
  background: url("https://upload.wikimedia.org/wikipedia/commons/6/69/Peters_projection%2C_white_%26_grey.png") 0 0/250% 100%, #008;
  animation: rotate 40s infinite linear;
  transform: rotate(calc(-23.4deg * var(--ang)));
}
.earth-container .globe:before, .earth-container .globe:after {
  content: "";
  position: absolute;
  inset: 100% 50% -80px;
  width: 1px;
  border-left: 2px solid #fff8;
}
.earth-container .globe:after {
  inset: -40px 50% 100%;
}
.earth-container .day-label {
  position: absolute;
  left: 0;
  z-index: 10;
  width: 50px;
  text-align: right;
  color: #fff;
  pointer-events: none;
}
.earth-container .day-label:after {
  content: "";
  position: absolute;
  inset: 50% -258.4px 50% 145%;
  border-bottom: 2px dotted #fff;
  border-top: 2px dotted #383977;
  z-index: 10;
}
.earth-container .day-label.north-label {
  top: 8%;
}
.earth-container .day-label.south-label {
  bottom: 10%;
}
.earth-container .shadow {
  position: absolute;
  width: 380px;
  height: 100%;
  z-index: 20;
  pointer-events: none;
}
.earth-container .shadow:before {
  content: "";
  position: absolute;
  inset: -200px 0;
  clip-path: circle(191px);
  box-shadow: inset -180px 0 20px 0 #000d;
  border-radius: 100%;
}
.earth-container .shadow:after {
  content: "";
  position: absolute;
  inset: 100% 50% -80px;
  width: 1px;
  border-left: 2px solid #fff8;
}
.earth-container .shadow .label {
  position: absolute;
  height: 16px;
  width: fit-content;
  bottom: -55px;
  left: calc(50% + 8px);
  color: #fff;
}
.earth-container .shadow .label:before {
  content: "";
  position: absolute;
  bottom: 22px;
  left: -237.5px;
  padding: 228px;
  border: 2px dotted #fff8;
  border-radius: 100%;
  clip-path: circle(calc( 46.8px * max(var(--ang), -1 * var(--ang)) ) at calc( 50% + ( 46.8px * var(--ang) ) ) 100%);
}

.orbit-container {
  position: relative;
  width: 650px;
  margin: 0 auto;
  max-width: calc(100vw - 80px);
  cursor: pointer;
}
.orbit-container:before, .orbit-container:after {
  content: "";
  position: absolute;
  inset: 37px 0 auto 0;
  height: 8px;
  border-radius: 100%;
  border: 2px dashed #fff8;
}
.orbit-container:before {
  border-bottom-width: 0;
  z-index: -10;
}
.orbit-container:after {
  border-top-width: 0;
  z-index: 5;
}
.orbit-container .earth {
  position: absolute;
  top: 10px;
  left: calc((var(--ang) * 50%) + 50% - 30px);
  z-index: var(--ang-z);
  border-radius: 100%;
  padding: 30px;
  animation: earthBg linear infinite;
  animation-duration: 1s;
  animation-delay: calc((1s * var(--ang-full)) - 1.75s);
  animation-play-state: paused;
  pointer-events: none;
}
@keyframes earthBg {
  0% {
    background: linear-gradient(90deg, #8686bd 50%, #393877 50%);
  }
  49.9% {
    background: linear-gradient(90deg, #8686bd 50%, #393877 50%);
  }
  50% {
    background: linear-gradient(-90deg, #8686bd 50%, #393877 50%);
  }
  100% {
    background: linear-gradient(-90deg, #8686bd 50%, #393877 50%);
  }
}
@keyframes earthFg {
  0% {
    transform: scale(1, 1);
    background: #8686bd;
  }
  24.9% {
    transform: scale(0, 1);
    background: #8686bd;
  }
  25% {
    transform: scale(0, 1);
    background: #393877;
  }
  49.9% {
    transform: scale(-1, 1);
    background: #393877;
  }
  50% {
    transform: scale(1, 1);
    background: #393877;
  }
  74.9% {
    transform: scale(0, 1);
    background: #393877;
  }
  75% {
    transform: scale(0, 1);
    background: #8686bd;
  }
  100% {
    transform: scale(-1, 1);
    background: #8686bd;
  }
}
.orbit-container .earth:before {
  content: "";
  position: absolute;
  inset: -15px 50%;
  width: 1px;
  transform: rotate(-23.4deg);
  border-left: 1px solid #fff8;
  z-index: 20;
}
.orbit-container .earth:after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  animation: earthFg linear infinite;
  animation-duration: inherit;
  animation-delay: inherit;
  animation-play-state: inherit;
}
.orbit-container .sun {
  position: absolute;
  top: 0;
  z-index: 5;
  left: calc(50% - 40px);
  border-radius: 100%;
  background-color: #dbae2d;
  padding: 40px;
  pointer-events: none;
}
.orbit-container .labels {
  padding: 120px 0 40px;
}
.orbit-container .labels div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.orbit-container .labels div:first-child span {
  display: inline-block;
  font-style: normal;
  border-bottom: 1px solid #fff8;
  padding: 0 3px;
  height: 16px;
}
.orbit-container .labels div:last-child {
  padding: 4px;
  font-size: 14px;
}