John and Doves,
 
From 4/8/2012, Obama's birthday at the centre of the London Olympics, to 11/9/2013 is 403 days or 13 x 31 days -
nice and symmetrical and 13 mirrored.

And all those memorials for 911 over the years usually include "a moment of silence".

Simple English gematria for that phrase = 169 or 13 x 13.

Coincidentally, 403 - 169 = 234 or 6 x (13+13+13).

Keep looking up,

Phil