Ken Rotberg spotted unusual phenomenon as sun dropped behind a storm cloud in the early evening of August 15, 2012 in Delray Beach, FL. Rare sight is also known as a Circumhorizon Arc.

Ken Rotberg spotted unusual phenomenon as sun dropped behind a storm cloud in the early evening of August 15, 2012 in Delray Beach, FL. Rare sight is also known as a Circumhorizon Arc.

Ken Rotberg spotted unusual phenomenon as sun dropped behind a storm cloud in the early evening of August 15, 2012 in Delray Beach, FL. Rare sight is also known as a Circumhorizon Arc.

Ken Rotberg spotted unusual phenomenon as sun dropped behind a storm cloud in the early evening of August 15, 2012 in Delray Beach, FL. Rare sight is also known as a Circumhorizon Arc.