artificial horizon

Tool · mentioned in 2 journal entries

Planning Westward Fort Clatsop Return Post-expedition NPS L&C NHT trail data © National Park Service
AI-extracted reference. Each entry below was identified by AI as mentioning artificial horizon. Spelling variants may not be merged. see related variants →
Lewis: January 26, 1805
Meriwether Lewis · Jan 26, 1805 · Fort Mandan (winter)
"water-based horizon for sun observation"
Clark: August 25, 1806
William Clark · Aug 25, 1806 · Rapid descent of Missouri, 70-80 miles/day
"used with sextant for observation" — transcribed as artificial Horizon

Our Partners