The Age of Discovery
The mid-to-late 15th century has quite rightly been called the AGE OF EXPLORATION and Discovery. It was an age in which European sailors and ships left the coastal waters of the Old World and embarked on their adventure on the vast "green sea of darkness." First, Portuguese ships, then Spanish and finally, in the late 15th and early 16th centuries, British, French and Dutch ships set out to discover a world, a world they originally called the Other World, but eventually called the Mundus Novus -- the New World.

Reference:
http://www.historyguide.org/earlymod/lecture2c.html
The History Guide: The Age of Discovery