What were two effects of the invention of the compass on China during the Middle Ages?

It enabled the chinese people to navigate the seas and participate in sea trades.

Explanation:

It insipired china to expand It's army and conquer more territory

The first compass was used not to point people in the right direction literally, but figuratively.

CompassKnowing what direction you are facing is a very valuable piece of information. 2.This is especially true if you are traveling: because you can use the information to help find your way or guide your safe return. There’s nothing much worse than getting hopelessly lost in the woods or successfully exploring a new frontier, only to find that you have no idea how to make it back home.

Explanation:

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isaac newton first proposed that earth was not perfectly round. instead, he suggested it was an oblate spheroid—a sphere that is squashed at its poles and swollen at the equator.

the idea of the earth being a flat disc is also inconsistent with the fact that a given lunar eclipse is only visible from half of the earth at a time. the only shape that casts a round shadow no matter which direction it is pointed is a sphere, and the ancient greeks deduced that this must mean the earth is spherical.

d) he bring down boss tweed and tammany hall.