Explain how technological and scientific advances contributed to the “era of exploration“ by european countries in the 15th and 16th centuries

With inventions like the astrolabe, explorers could better calculate where they were. By calculating they could better know their latitude and location on a map. Improvements on the magnetic compass also helped explorers to keep from getting lost on land or sea. Improvements in cartography (map-making) and the creation of the printing press made the maps look much more uniform and closer to what we see today in satellite images. Improved ship design also allowed explorers to sail further and faster. They also started to understand currents. 

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.