John and Doves,Fay, I will try to find time to watch your programme on The Gulf Oil Disaster.You mentioned the date being 20th April 2010.From 20/4/2010 to Japan 9.0 quake on 11/3/2011 is 325 days.325 = 5 x 13 x 5.And, the number of days between these two events is 324 days.324 = 18 x 18, or (6+6+6) x (6+6+6).Keep looking up,Phil.