Make simple animations using Javascript in HTML page.

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       // description: elliptical motion on a canvas.
       window.onload = function()
          // contexts.
          // planet
          canvasEarth = document.getElementById("canvasEarth");

          contextEarth = canvasEarth.getContext("2d");
          // sun and stars
          canvasBackground      = document.getElementById("canvasBackground");

          contextBG    = canvasBackground.getContext("2d");

          // planet turning around
          var radiusChange    = 0.6;
          // planet eclipse focus
          var xPos       = canvasEarth.width/2;   
          var interval   = 33;
          var yPos       = canvasEarth.height/2;...
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