Answer:
An Astrolabe
Step-by-step explanation:
As we know that we need to find the positions of Sun and Stars
So here we will analyze the given options
1) A Caravel
2) A Carrack
above both are two different types of Sailing ships so they can not be the answers as we can not measure the positions of sun and star with the help of ship
4) Compass
It is magnetic needle placed in horizontal plane and it is used to find out the directions and worked on the magnetic field of Earth
3) An Astrolabe
This devise is used to find out the position of Sun and other Celestial bodies and used by astronomers in past time
so correct answer will be
An Astrolabe