Matches in DBpedia 2014 for { ?s ?p John Hadley (16 April 1682 – 14 February 1744) was an English mathematician, inventor of the octant, a precursor to the sextant, around 1730.. }
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- John_Hadley abstract "John Hadley (16 April 1682 – 14 February 1744) was an English mathematician, inventor of the octant, a precursor to the sextant, around 1730.".
- John_Hadley comment "John Hadley (16 April 1682 – 14 February 1744) was an English mathematician, inventor of the octant, a precursor to the sextant, around 1730.".