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var i = Date.now();

function rotate() {
    var a = .1;
    var t = Date.now();
    var n = (t - i) / 1e3;
    i = t;
    viewer.scene.camera.rotate(Cesium.Cartesian3.UNIT_Z, -a * n);
}

viewer.clock.onTick.addEventListener(rotate);
setTimeout(function() {
    viewer.clock.onTick.removeEventListener(rotate);
}, 5000);