The Monroe Doctrine simply stated that the west will not interfere with the affairs of Europe as long as they didn't interfere with us. This enabled us to be able to deal with the smaller countries and help them reform their government. The Monroe doctrine allowed the United States to become "protectors" of the smaller countries in the western hemisphere.
The practical importance of astronomy in ancient times is that it allowed people to navigate. The land on the earth changes frequently but the stars do not. The saying,”Follow the North Star” that means if you find your self lost and without a compass this Star will show where the North is located.
Reaching out to Americans who had traditionally not participated in political process.
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It set a precedent for monarchs sharing power with Parliament. It meant that France and Spain would never again challenge England. It did away with the constitutional monarchy.