What instrument did navigators use to calculate the positions of the sun and the stars?
a. a caravel
b. a carrack
c. an astrolabe
d. a compass

The correct answer is C) An astrolabe.

A caravel is a type of ship used by European explorers during the 15th and 16th centuries. This sleek and easy to manuever ship allowed for easier travels for several explorers.

A carrack is also a type of ship that was primarily used in Europe during the 14th and 15th centuries.

A compass is a tool that allows an individual to determine which direction they are going (aka north, south, east, or west).

Based on this information, this shows that only letter C can be the correct answer.

a. An Astrolabe

Explanation:

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.