On 4/15/23 (Tax Day) the Washington Monument Capstone will be 7219 weeks old

 7219 is the 923rd prime number 

"Feast Of Trumpets" = 923 (Latin)

"Vengeance Of God" = 923 (Latin)

"The Angel Of Destruction" = 923 (Latin)

"Sirius The Dog Star" = 923 (Latin)

"Washington Capstone" = 223 (Ordinal) (year 2023)

4+15+2+0+2+3 = 26

From and including: Saturday, December 6, 1884

To, but not including Saturday, April 15, 2023

Result: 50,533 days

Or 138 years, 4 months, 9 days 

Or 1660 months, 9 days 

7219 weeks