Stories by Subject
Celestial navigation, hydrography, longitude, charting, and measurement at sea.
4 articles
Featured Story
Satellites cannot reach through seawater, so marine geodesists combine GNSS at the surface with acoustic ranging below to measure tectonic motion on the deep ocean floor.
Read ArticleHow sextants, chronometers, astronomical tables, and hydrographic surveys made ocean navigation repeatable.
How John Harrison’s marine timekeepers turned reference time into a practical east-west position at sea.
How latitude, dead reckoning, soundings, and disciplined observation guided sailors before dependable longitude.
