Table 1

Some example lines of the machine-readable version presented in this work on the sunspot and prominence observations made by Secchi published in Le Soleil. The first column shows the number of each solar rotation in Roman numerals, followed by the date (year-month-day format) when the solar rotation starts, the number of prominences in the northern and southern hemisphere respectively, the number of observation days of prominences, the daily average of the prominence number, the number of new sunspot groups observed for each solar rotation, the sunspot area (one unit is defined such as 1 mm in height corresponds to 8 arcseconds and one degree at the limb corresponds to 16 arcseconds), the number of observation days in the case of sunspots, and the daily average of sunspot area.