What was Halley's role after the expeditions?
Observing terrestrial magnetism’s conditions
Creating maps of the southern hemisphere
Teaching astronomy at Oxford
Writing a sequel to Principia Mathematica
Answer
Observing terrestrial magnetism's conditions, Halley became the first to discover isogonic lines—lines that connect areas with equal magnetic declination. Appointed the Savilian Professor of Geometry in Oxford, he published many significant papers, one of which outlined Theory of elasticity, which relates stress and strain in solid materials.
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