The technique of determining location and direction in space or at sea by observing and measuring the positions of stars and celestial objects.
From 'astro-' (star) and 'navigation' (finding one's way). Sailors used this method for centuries before it became essential for spacecraft and modern aircraft navigation.
Astronavigation is how Polynesian navigators crossed the entire Pacific Ocean without instruments—using only star knowledge—yet modern spacecraft use these same principles with computers!
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