All of the Following Are Associated with Scientific Steps in the Search

 All of the following are associated with scientific steps in the search for determining longitude at sea except

A) determining lunar distance.
B) how to accurately measure the position of the moon in relation to the sun by day.
C) timing of the Jupiter's eclipses.
D) how to accurately measure the position of the moon in relation to the stars by night.
E) worldwide separate star systems had be created for different skies in the southern hemisphere.