![]() Many of these differences were solved by Clette et al. In 1998, Hoyt and Schatten presented a new reconstruction of solar activity that was very different from Wolf's reconstruction (Vaquero and Vázquez, 2009). The Zurich Observatory (and later the Brussels Observatory) was in charge of continuing Wolf's work to the present day. The first attempt to reconstruct solar activity from these records was made by Rudolf Wolf, who defined the Sunspot Number index in the 19th century. For this reason, it is possible to rescue the ancient observations of sunspots made in the past centuries to obtain an image of the evolution of solar activity during the last four centuries. This task can be done even with small telescopes since the Sun is apparently a very large and luminous star. A very simple measure of solar activity is counting sunspots using telescopes. ![]() Solar activity is an essential factor for the study of many aspects of the geophysical and astronomical sciences. ![]()
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