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un:space-physics [2024/10/03 06:20] – asadun:space-physics [2024/10/03 06:22] (current) – [1.2 Eighteenth-Nineteenth Centuries] asad
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 Exactly in 1600 William **Gilbert's** famous book 'De Magnete' was published. It clearly states that the whole earth is magnetic. Gilbert, however, assumed that the Earth's magnetic field was constant, which was incorrect. In the seventeenth century it was known that the declination angle changes with time. In the last decade of this century, Edmond Halley's royally funded expeditions across the Atlantic Ocean to the north and south ushered in a new wave of geomagnetism research. I have already mentioned Halley and de Mairan's debate about the cause of the aurora. The seventeenth century began with Gilbert's book in 1600 and ended with Halley's Voyages in 1700. Exactly in 1600 William **Gilbert's** famous book 'De Magnete' was published. It clearly states that the whole earth is magnetic. Gilbert, however, assumed that the Earth's magnetic field was constant, which was incorrect. In the seventeenth century it was known that the declination angle changes with time. In the last decade of this century, Edmond Halley's royally funded expeditions across the Atlantic Ocean to the north and south ushered in a new wave of geomagnetism research. I have already mentioned Halley and de Mairan's debate about the cause of the aurora. The seventeenth century began with Gilbert's book in 1600 and ended with Halley's Voyages in 1700.
  
-==== - Eighteenth-Nineteenth Centuries ====+==== - The 18th-19th Centuries ====
  
 Considerable work was done on the terrestrial part of solar-terrestrial physics by the seventeenth century, but progress on the solar part took longer. Galileo observed sunspots with a telescope, but in the latter half of the seventeenth century the number of sunspots had declined greatly, and no further work could be done on them. Considerable work was done on the terrestrial part of solar-terrestrial physics by the seventeenth century, but progress on the solar part took longer. Galileo observed sunspots with a telescope, but in the latter half of the seventeenth century the number of sunspots had declined greatly, and no further work could be done on them.
un/space-physics.1727958005.txt.gz · Last modified: by asad
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