Which of the Following Explains Why Navigators a Few Hundred

Multiple Choice

Which of the following explains why navigators a few hundred years ago found it much more difficult to determine their longitude than their latitude?

A) Determining longitude requires mathematical techniques that were not known at the time.
B) Determining longitude without modern instruments requires being able to see the Moon.
C) Determining longitude requires much more precise measurements of angles in the sky than does latitude.
D) Determining longitude requires having an accurate clock.