Celestial navigation was used by our ancestors many centuries ago. It has not lost its relevance to spacecraft operations even today.
Unaided human eyes can see only about 6 thousand stars on the celestial sphere. The task of navigating by them does not seem trivial. Observing stars from onboard of a spacecraft brings special challenges, including the small viewing angle through portholes, high velocity motion (leaving only a shot amount of time available to observe a particular object as the scenery changes rapidly), as well as the fact that even easily recognizable constellations, like the Big Dipper, may appear in completely unusual orientations.
Since the beginning of space exploration astronauts were charged with the task of being able to recognize visible landmarks in the celestial sphere and navigate using well-known stars.
We suggest that you take a test lesson at the Planetarium of the Cosmonaut Training Center. Get acquainted with Cepheus and Cassiopeia, Andromeda and Perseus and experience the role of Space Navigator.