Longitude is conveniently determined at sea using
A) a clock without a pendulum (i.e. a marine chronometer).
B) noon Sun angles.
C) magnetic compasses.
D) sextants.

Question

Quizplus · Accepted Answer

Longitude is commonly determined at sea using a clock without a pendulum also known as a marine chronometer. This chronometer was developed in the 18th century to measure longitude accurately at sea. It enabled sailors to determine their longitude by comparing the local time with an accurate time standard known as Greenwich Mean Time.

Longitude Is Conveniently Determined at Sea Using