\HeaderA{sunspots}{Monthly Sunspot Numbers, 1749--1983}{sunspots}
\keyword{datasets}{sunspots}
\begin{Description}\relax
Monthly mean relative sunspot numbers from 1749 to 1983.  Collected at
Swiss Federal Observatory, Zurich until 1960, then Tokyo Astronomical
Observatory.
\end{Description}
\begin{Usage}
\begin{verbatim}sunspots\end{verbatim}
\end{Usage}
\begin{Format}\relax
A time series of monthly data from 1749 to 1983.
\end{Format}
\begin{Source}\relax
Andrews, D. F. and Herzberg, A. M. (1985)
\emph{Data: A Collection of Problems from Many Fields for the
Student and Research Worker}.
New York: Springer-Verlag.
\end{Source}
\begin{SeeAlso}\relax
\code{\LinkA{sunspot.month}{sunspot.month}} has a longer (and a bit different) series.
\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
plot(sunspots, main = "sunspots data", xlab = "Year",
     ylab = "Monthly sunspot numbers")
\end{ExampleCode}
\end{Examples}