By Kent and Carolyn Carlson | Little Horseshoe Park, Rocky Mountain National Park, CO

By Deborah Allen | Driving south on Route 95 outside Richmond VA

By Dr Ski | Valencia Observatory

By Dr Ski | Valencia Observatory

By Dr Ski | Valencia Observatory

By Dr Ski | Valencia Observatory

By Hassan Dadashi.arani | Esfahan.iran

By Riste Spiroski | Ohrid, Macedonia

By masoud riyazati | Westfhords, Iceland

By Peter Lowenstein | Mutare, Zimbabwe

By Peter Lowenstein | Mutare, Zimbabwe

By Mohamed Mohamed | Tripoli,Libya

By christopher kipkemei | Nairobi, Kenya

By Lorna Burley | Off Cumbria, over the Irish Sea, UK

By Steve Shubert | Chester, VA

By Judy Rogers | Glendale, California