[Dilettante_Pro]

Крутится скачками

<style>
.cell {  position:absolute;
         display:block;
         width:100px;
         text-align: center;
         font-family:Arial;
         -webkit-transition: 0.5s ease;
      -moz-transition: 0.5s ease;
      -o-transition: 0.5s ease;
      transition: 0.5s ease;
      }
</style>
<div class="cont">
   <div class="cell"></div>
   <div class="cell"></div>
   <div class="cell"></div>
   <div class="cell"></div>
   <div class="cell"></div>
   <div class="cell"></div>
   <div class="cell"></div>
   <div class="cell"></div>
   <div class="cell"></div>
</div>
<script>
var tim = 21,
cell = document.querySelectorAll(".cell");

function showTime() { 
  var currInt = Math.floor(tim);
  var currChr = currInt.toString();
  currChr = currChr.length == 2? currChr: "0" + currChr;
  var result = currChr + ":" + (currInt != tim?"30":"00");
  tim = tim + 0.5;
  if(tim == 24) tim = 0;
  return result;
}

for (var i = 0; i < 9; i++) {
      var sinus = Math.sin(i * Math.PI / 8),
            cosin = 1 - Math.cos(i * Math.PI / 8);
      cell[i].style.top = (cosin * 100 - 10 * sinus) + "px";
      cell[i].style.opacity = sinus;
      cell[i].innerText = showTime();
      cell[i].style.fontSize = 20 * sinus + "px";
};


function timLoop () {        
   setTimeout(function () {
       var change = document.querySelector(".cell");
       change.innerText = showTime();       
       document.querySelector(".cont").appendChild(change);
       cell = document.querySelectorAll(".cell");
       for (var i = 0; i < 9; i++) {
             var sinus = Math.sin(i * Math.PI / 8),
                   cosin = 1 - Math.cos(i * Math.PI / 8);
             cell[i].style.top = (cosin * 100 - 10 * sinus) + "px";
             cell[i].style.opacity = sinus;
             cell[i].style.fontSize = 20 * sinus + "px";
       };
        timLoop();    
   }, 1000)
}

timLoop();  
</script>