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- Cartography (10500 bytes)
30: ... Optical technology, such as the [[telescope]], [[sextant]] and other devices that use telescopes, allowed ... - Timeline of invention (28171 bytes)
135: * [[1731]]: [[Sextant]]: [[John Hadley]] - Compass (8275 bytes)
3: ...n be used in conjunction with a [[clock]] and a [[sextant]] to provide a very accurate [[navigation]] capab... - Astrolabe (4446 bytes)
6: ...igation]]al instrument until the invention of the sextant in the 16th century. Some historians credit the i... - San Francisco, California (55022 bytes)
343: ...]] and on the other a [[Sailing|sailor]] with a [[sextant]]. Above is a rising phoenix and behind is the ba... - Frederick Cook (12772 bytes)
37: ... intermittently claimed he had kept copies of his sextant navigational data and in 1911 published some whic... - Navigation (15650 bytes)
37: ...n the measurement of stars and planets with the [[sextant]] allowed ships to navigate the open ocean withou...
65: ...izon by reflecting a bubble. Inexpensive plastic sextants are available, though they have less accuracy th...
97: ...rror of an [[astrolabe]]'s short pointer. Modern sextants measure to 0.2 minutes of arc, an error that tra...
131: *[[Sextant]] - Ancient Indian science and technology (21581 bytes)
101: Even around ''circa'' 500 AD, [[sextant]]s and mariner�s [[compass]] were not unknown ... - 18th century inventions (2219 bytes)
11: * [[1731]]: [[Sextant]]: [[John Hadley]] - Vernier scale (1907 bytes)
3: Verniers are common on [[sextant]]s, machinists' measuring tools (all sorts, but e...
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