text: Alxidmaten ti iknanen uglay šund tann Struve Geodetic Arc daɣ alqiblat tan Eroba ɣur awatay wan (1816 har 1855) d Farak n Tigonometrical maqqoran n India ɣur awatay wan (1802 har 1871) ahoj mušam ewad ittus n mirda tan n dumu wan Ellipsoid wan akal