What advantage did the astrolabe give sailors? It allowed them to more accurately measure the depth of the water.
It allowed them to more accurately know their direction.
It allowed them to more accurately know how long they had been at sea.
It allowed them to more accurately measure latitude.

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.