Exploration & Places
Surveying Across the Seas, Part 3: Sextants, Almanacs, and the Surveyed Ocean
How sextants, chronometers, astronomical tables, and hydrographic surveys made ocean navigation repeatable.
From the Index
Tag: Series: Surveying Across the Seas
A connected three-part story of navigation and ocean surveying. Reading order: Part 1 (post 701), Part 2 (post 702), Part 3 (post 704).
People of Surveying
Surveying Across the Seas, Part 2: John Harrison and the Clock That Carried Longitude
How John Harrison’s marine timekeepers turned reference time into a practical east-west position at sea.
Exploration & Places
Surveying Across the Seas, Part 1: Before Longitude
How latitude, dead reckoning, soundings, and disciplined observation guided sailors before dependable longitude.