More ambitious undertakings such as the Struve Geodetic Arc across Eastern Europe (1816-1855) and the Great Trigonometrical Survey of India (1802-1871) took much longer, but resulted in more accurate estimations of the shape of the Earth ellipsoid.
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