google.load("earth", "1");

var ge = null;
var lookAt;

function init() {
    google.earth.createInstance("map3d", initCB, failureCB);
   
}
function initCB(object) {
  
     ge = object;
  ge.getWindow().setVisibility(true);
  ge.getSun().setVisibility(true);
  lookAt = ge.createLookAt('');
  ge.getTime().getControl().setVisibility(false);
  lookAt.set(0.0, 0.0, 2000000, ge.ALTITUDE_RELATIVE_TO_GROUND, 0, 0, 0);
  lookAt.setTilt(25);
  ge.getView().setAbstractView(lookAt);
  var options = ge.getOptions();
   options.setFlyToSpeed(5);

}

function failureCB(object) {
  alert('load failed');
}

function twirl() {
var lat;
var lng;
 var lookAt = ge.getView().copyAsLookAt(ge.ALTITUDE_RELATIVE_TO_GROUND);
 

lat=(lookAt.getLatitude() + 0);
lng=(lookAt.getLongitude()+0.1);


if (lng>=179.9) {
lng=-179.9;
};

//  lookAt.setLatitude(lat);
//  lookAt.setLongitude(lng);

lookAt.set(0.0, lng, 2000000, ge.ALTITUDE_RELATIVE_TO_GROUND, 0, 0, 0);
 lookAt.setTilt(25);
     ge.getView().setAbstractView(lookAt);

}

function showSun(choice) {
      if (choice) {
      
      ge.getSun().setVisibility(true);
      return;
      
   };
   
   ge.getSun().setVisibility(false);
   return;
   
   
}

function show() {

window.setInterval(twirl, 20);

};