After The Sundering of the Moon, the vast majority of lunar fragments that did not fall to the Earth. Fragments stayed in the Earth’s orbit forming a chaotic cloud of crashing stone and dust. Collisions caused deadly fragments to rain down on the planet below. Scientists predicted that these conditions would last for more than a hundred years.
Contrary to these predictions, the fragments began to stabilize into a broad belt in Earth’s high orbit. Within a year of the catastrophe, the Lunar Belt settled into its current, mostly stable shape. The scientific community was at a complete loss to explain the formation of the Lunar Belt.
The Lunar Belt casts a broad shadow on much of the Earth during the daylight hours. This causes brief periods of dusk-like darkness lasting several minutes at a time. These moments of darkness are now known as the Lunar Curtain. Most areas of the Earth are affected by the Lunar Curtain at least once a day.
During certain months of the year, the angle of the Sun and the Lunar Belt cause an extended Lunar Curtain in extreme north and south areas. These periodic outages are predictable and can last several weeks. The largest extended Lunar Curtain occurs over northern Europe and Russia twice a year. It is called the Siberian Curtain. The second largest Lunar Curtain occurs over the southern tip of South American and is called the Strong Southern Curtain.