The difficulty of making precise observations at sea owing to the motion of the ship was one that had occupied men's minds since the first introduction of astronomical navigation.
Ubunzima bokwenza ugqaliselo olululo elwandle ngenxa yokushukuma kwenqanawa, bebusoloko buminxe iingqondo zamadoda, sukela okokoko kwaziswa uqhubo sikhephe kulandelwa ugqaliselo zinkwenkwezi.