Placing the marks on the sky.

[TMR]

Hi, I'm newbie to Google earth plug-in.

I want to create placemark at somewhere in the sky. 

I tried a sample code

// Create the placemark.
var placemark = ge.createPlacemark('');

// Set the placemark's location.  
var point = ge.createPoint('');
point.setLatitude(12.345);
point.setLongitude(54.321);
placemark.setGeometry(point);

// Add the placemark to Earth.
ge.getFeatures().appendChild(placemark);

But it doesn't work!

How I should do?

Thanks!