Sunspot Catalog (1921–1935) and Area Series (1886–1940) from the Stonyhurst College Observatory

A sunspot observation program was started at the end of 19th century Stonyhurst College Observatory (hereafter SCO) by Father Perry, director observatory that time. digitization daily area series recorded in this from 1886 to 1940 (with a gap between 1889 and 1897) is provided work. This depicts one oldest available. comparison with contemporary made other observatories shows SCO generally larger areas than those some time such as, for example, Royal Greenwich (RGO). Furthermore, published group catalog period 1921–1935. We provide machine-readable version catalog. compared number data obtained observatories. In case, RGO systematically more groups SCO. distribution functions obtaining calibration constant both sets. also butterfly diagram latitudes percentages types computed Valencia (following Cortie morphological classification groups), identifying their similarities differences.