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The variations of daily mean horizontal force in the years 1844 and 1845 showed several well-marked oscillations, having periods of from 20 to 30 days, and amplitudes, in some cases, of more than one thousandth of the whole magnetic force. These oscillations were first attributed to lunar action; afterwards they were found more probably due to the sun’s rotation on his axis.

proceedings of the royal society of london

On the variations of the daily mean horizontal force of the Earth's magnetism produced by the sun's rotation and the moon's synodical and tropical revolutions