They are easier to carry.
They can be used for navigation within a city.
The model were the sun is in the center of the solar system is called heliocentric.
Have a nice day! :)
A: A command economy<span> is one in which a centralized government controls the means of production. ... There are </span>advantages<span> and disadvantages of </span>command economy<span> structures. </span>Command economy advantages<span> include low levels of inequality and unemployment and the common good replacing profit as the primary incentive of production.</span>
