Don't worry John Matrix you will see the code after a few posts, i'm saying that dates in American history usaully are aligned to the Star Sirius or Alnilam, either by midnight, sunrise or sunset.
Lets look at the White House:-
White House - Wikipedia, the free encyclopedia
Started on 13th October 1792, here the alignment is that Sirius is rising at midnight, i can't forever use colours, so this is in black and white, the red line shows the curve of the Earth at Midnight over Washington D.C. at midnight showing Sirius rising, on download:-