Well, there are a few types of planetary movement, a planet moves in an elliptical and orbital pattern that can be observed by keeping watch on how many times a year you see it in the sky; with this information you will be able to predict its movement patterns by the frequency of orbital movement as well as the interval between each appearance.
Oh and BTW next time, try posting a SCIENCE question in the Physics category?
Answer:
Development of overseas trade between west Africa and Europe
Explanation:
In 1419,Prince Henry of Portugal started the first school of navigation at Sagres, Portugal. The school trained people in navigation and map-making science, preparing them for their Ghana domination for their large gold deposit from 1471.
crust and mantle.....................................
Answer:
The mantle layer is where manga comes from
Explanation: I know stuff
