Castle to Bishop

The DC pendulum run time here made me wonder where the slowest pendulum is set up. Museums in Thailand and South India have low numbers, but it looks like the one in Caracas, Venezuela would be slowest, at about 10 degrees latitude. Works out to take about 140 hours to complete a rotation. If they were run by Smithsonian hours, they could start the pendulum on Friday, and it would almost complete a revolution by closing time on Tuesday (with Wednesday and Thursday off). 

2.6 degrees per hour makes it an excruciatingly idle exhibit.

Here is the second part of the Cosmic Void scroll clue. A statute mile is our normal, familiar 5280 foot mile, and aurea sectio is (as we have had to stand and deliver many times to get here) 1.618. We need to strike a circle starting at the pendulum site, with a 2 * 1.618 mile radius - and see what we intersect with the indicated pendulum plane direction (in red).

The way Google maps annotates maps at this scale sort of gives this away - when we remember the window hint we saw at the end of running up to this clue:

And the colorized version of this graphic:

We are at the Space Window of the National cathedral! - which we will explore in much more detail - next time.