Abstract
1. IT is well known that Prof. Rudolph Wolf has endeavoured to render observations of sun-spots made at different times, and by different observers, comparable with each other, and has thus formed a list exhibiting approximately the relative sun-spot activity for each year. This list extends back into the seven teeth century, and is unquestionably of much value. Nevertheless it must be borne in mind that we possess no sun-spot data sufficiently accurate for a discussion in a complete manner of questions relating to solar periodicity before the time when Schwabe had finally matured his system of solar observations, which was not until the year 1832.
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Magnetic Declination 1 . Nature 23, 592–593 (1881). https://doi.org/10.1038/023592a0
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DOI: https://doi.org/10.1038/023592a0