GPS can tell you where you are without requiring you to know why. Celestial navigation belongs to the older tradition where the sky is part of the instrument.
Visit A Short Guide to Celestial Navigation
Henning Umland’s CelNav homepage presents an introduction and tutorial, freeware, links, and supporting material for people learning to determine position from celestial observations.
The page’s visitor counter dates back to May 20, 1997.
Its last listed update is from 2019, and the homepage proudly notes that it is powered by Linux.
This is exactly the kind of compact technical site that used to be common: one person, one subject, one directory tree, no attempt to turn the material into an endless feed.
A technique worth understanding even when satellites work
Celestial navigation combines astronomy, timekeeping, geometry, observation, and practical instrument use.
A sextant observation does not produce a magic coordinate. The navigator has to understand what was measured, when it was measured, which celestial body was observed, and how that observation constrains position on Earth.
That makes the subject unusually well suited to a tutorial site.
Even readers who never intend to cross an ocean using a sextant can learn something about the relationship between clocks, stars, angles, and maps.
The old web was good at preserving skills like this because publishing did not require a commercial audience.
A person who knew a difficult technique could simply explain it.
The surrounding 1,967 Ancient Web Domains research list contains many pages with the same character: modest homepages attached to surprisingly deep practical knowledge.
CelNav is a good example because the interface stays out of the way.
There is no lifestyle branding around “navigation.” There is a guide, software, and a path into the subject.
Sometimes the old web’s greatest design achievement was knowing when to shut up and let the technical material be the site.