Sun-Spot Observations at the Potsdam Observatory

Abstract

IN the publications of the “Potsdam Astrophysical Observations,” Dr. Sporer has previously (No. 17) presented us with the observations of the sun-spots for the years 1880 to 1884. The most recent addition to these records will be found in No. 32, in which are collected ihe sun-spot observations for the years 1885 to 1893. The observations themselves are given in all details, being grouped together wilh regard to the period of rotation. These are followed by a brief discussion, from which these notes and extracts have been made. Ths following table, bringing together the results relative to frequency and positions (as regards latitude) of the spots may be first given, as many references will be made to the numbers therein:—