Abstract
The available data on the sunspot number derived from telescopic observations are analyzed. It has been indicated that uncertainty in the data on the number of sunspot groups is close to 30% for the 17th century-the early 19th century and reaches a factor of 2 and more in individual years. This means that the above data include limited information on solar activity in the 17th–18th centuries and it is necessary to use external sources (first of all, the data of paleoastrophysics) in order to study this activity in the indicated epoch. Only from the middle of the 19th century, information obtained based on instrumental observations became sufciently accurate for reliable quantitative estimates.
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