A Surveyor Looks at the Washington DC map - Part 2

A Surveyor Looks at the Washington DC map - Part 2

In this video I show that the streets around the White House form a rhombus shaped grid by connecting the points of the pentagram in the map. I show how this grid is anchored in Georgetown.

Next I examine the bend in Pennsylvania Avenue caused by the particular placement of the Capitol Building. If the CB had been located a little bit to the south, Penn Ave would have been straight all the way from Georgetown to the river.

The bend in PA sets up two more grids in the south and eastern parts of the map. The segment from the CB to the WH forms a 19.5 degree angle; the sine of 19.47 is .3333.

The segment of Penn Ave south and east of the CB forms a 26.5 degree angle; tan 26.5 is .5. Lincoln Square was placed one mile east of the CB, and the rhombus between them centers on 77 degrees west longitude.

Category:

Education

Tags:

• Washington
• DC
• map
• layout
• surveyor
• surveying
• survey