The object was staying in the sky and was emitting light from huge, round lights on all of its four edges.

I went into a smaller building in the yard when I saw it. The sky was completely clear, without clouds and the Moon could not be seen.
Later I returned into the house and looked at it every 5 minutes then it disappeared. I did not see its further movements. When I last wanted to see it, a sharp light could be seen at a height of approx. 10,000 metres but no shape could be determined then. I just guess that it was the same object. At this latter height, some cloud-like material could be seen around the source of light but there had been no clouds in the sky during the day and at night either.
The attached file shows the approximate coordinates of the object's point of observation.
I was watching toward south-east, my back toward north-west.
The mentioned sharp light with haze on one side moved toward south, south-east and elevated at the same time.