Common year starting on Friday has only one Friday the 13th; The only Friday the 13th in this common year occurs in August. Leap years starting on Thursday share this characteristic, but also have another one in February. This is the only year type where the "n"th "Doomsday" (this year Sunday) is not in ISO week "n"; it is in ISO week "n"-1. In the (currently used) Gregorian calendar, the fourteen types of year (seven common, seven leap) repeat in a 400-year cycle (20871 weeks). Forty-three common years per cycle or exactly 10.75% start on a Friday. The 28-year sub-cycle does only span across century
On the 13th Day the time of its release. The song "Let It Rain" was released as the first single from the album. Bob Catley has stated that he considers "On the 13th Day" to be Magnum's rockiest album to date, with the track "Dance of the Black Tattoo" possibly classifying as a heavy metal song. On the 13th Day On the 13th Day is the 17th studio album from the rock group Magnum (including "Keeping the Nite Light Burning" and ignoring "Evolution"), which was released in September 2012, under the label of Steamhammer Records/SPV. The cover artwork was painted by Rodney Matthews. The