Sidi lan, loktu awo na cintun kurube shiro teleskob gultinma dǝ-a agogo pendulum ye-a tando baditǝna dǝ lan har dawu dawu kǝrnu 18th ye isǝna lan, nawa nguwu longitude nza kalkalro asutǝnama so dǝ tǝrana, nguwusoro taltǝ zadǝ falyema sǝtǝnyi lan, nguwuso 2-3°.