The sun must be very high in the sky and it can not be seen at a latitude above 55degrees north (which includes Scotland and much of Canada) or below 55 degrees south.

The Cassini images also revealed a never-before-seen large, dark oval around 60 degrees north latitude that rivaled Jupiter's Great Red Spot in size.

The epicenter was monitored at 22.5 degrees north latitude and 113.9 degrees east longitude, with a depth of about 23 kilometers, said the station.