What observations regarding terrestrial magnetism did Halley make?
Its conditions during sailing expeditions
Its effects on human health
Its use in compass construction
Its absence on Venus
Answer
Halley's observations during his sailing expeditions revealed important insights into terrestrial magnetism. He noticed that the magnetic compass deviates from true North at various locations, introducing the concept of magnetic declination. Additionally, he observed that these deviations change over time, suggesting the dynamic nature of Earth's magnetic field. These findings laid the groundwork for subsequent studies in geomagnetism and contributed to our understanding of Earth's complex magnetic phenomena.
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