The electromechanical angle computer inside the B-52 bomber's star tracker

Before GPS, how did aircraft navigate?
One important technique was celestial navigation: navigating from the positions of the stars, planets,
or the sun.
While celestial navigation is accurate, cannot be jammed, and doesn't require any broadcast infrastructure,
it is a difficult and time-consuming process to perform manually.
In the early 1960s, an automated system was developed for the B-52 bomber to automatically track
stars and compute navigation information.
Digital computers weren't suitable at the...