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Paper: The Solar Sunspot Periodicity
Volume: 335, The Light-Time Effect in Astrophysics: Causes and Cures of the O - C diagram
Page: 199
Authors: Sterken, C.
Abstract: We give a short account of the history of sunspot observations, and of historic studies of the sunspot period. Using a compilation of sunspot index numbers, the variability of the sunspot cycle is discussed from an instructive point of view and as a demonstration of the O – C method applied to a unique database covering more than three centuries of a standardised variability index.
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