Summary Table of Schwabe's sunspot observations, as published in volume III of Alexander von Humboldt's Kosmos. The Table lists, for years between 1826 and 1850 (first column), the total number of sunspots groups observed on that year (second column), the number of days without sunspots (third column), and the number of days for which the Sun was observed (fourth column).
von Humboldt, A. 1850, Kosmos. Entwurf einer physischen Weltbeschreibung, Stuttgart [199X reprint of english trans., XXX]
-Written and last revised 29 December 1997 by paulchar@ucar.edu.
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