Similarly, this NASA blog post has some fun facts about the precision of pi that JPL uses in its calculations:

https://www.jpl.nasa.gov/edu/news/2016/3/16/how-many-decimal...

* JPL's highest accuracy calculations, which are for interplanetary navigation, we use 3.141592653589793.

* How many digits of pi would we need to calculate the circumference of a circle with a radius of 46 billion light years to an accuracy equal to the diameter of a hydrogen atom (the simplest atom)? The answer is that you would need 39 or 40 decimal places.