Shigarwa: Gwajin Schiehallion wani gwaji ne na karni na 18 don ƙayyade matsakaicin matsakaicin Duniya. An ba da kuɗin ta hanyar tallafi daga Royal Society, an gudanar da shi a lokacin rani na 1774 a kusa da dutsen Scottish na Schiehallion, Perthshire. Gwajin ya haɗa da auna ƙananan karkatarwar pendulum saboda jan hankalin dutsen da ke kusa. An dauki Schiehallion a matsayin wuri mafi kyau bayan neman 'yan takara, godiya ga keɓewa da kusan siffar symmetrical. Daya daga cikin abubuwan da ke haifar da gwajin sune abubuwan da aka lura yayin binciken layin Mason-Dixon. Tambaya: Menene gwajin Schiehallion yake ƙoƙarin cim ma?
don ƙayyade matsakaicin ƙarancin duniya