The SR-71 used an Astroinertial Navigation System that used stars to keep the navigation information accurate as the plane flew over long distances. Normally an inertial navigation system degrades in accuracy over time and distance due to small errors building up and something called gyro drift. The NAS-14V2 used a catalog of known stars and a gimballed telescope to identify specific stars (even during a cloudy day) and determine the position of the stars in relation to the aircraft. Using this information the position of the aircraft can be used to revise the inertial navigation system’s data every so often so the accuracy is much better.

This is not a great explanation of radix economy of Base e.

Slaughterhouse Five (the book) did this fairly well, though the movie isn’t much better than Madame Web.

Timeline! The movie was completely forgettable but the concept was pretty cool. I loved the book.