Page:The origin of continents and oceans - Wegener, tr. Skerl - 1924.djvu/145

Rh 18 years about 0.51″. According to Kostinsky and Sokolow, Pulkowa observatory also showed a secular decrease of latitude. But since the discovery was made that systematic errors of similar dimensions arise through local refraction in the observatories, all deviations have been attributed to this source of error. Meanwhile those who believe that the international observations of latitude for Europe and America show a change of latitude are, of late, becoming more numerous, but it must be admitted that this change appears now to be in the nature of an increase of latitude.