Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..335..199s&link_type=abstract
The Light-Time Effect in Astrophysics, Proceedings of ASP Conference Series, Vol. 335, held in Brussels 19-22 July 2004. Edited
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
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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