I learned about two inventions and two inventors. The two inventions are the Mercator Projection Map and the Backshaft. The two inventors are Mercator and Tycho Brahe. First, I learned about the Mercator Projection Map. After some refinements, the Mercator Projection became standard by the mid 1600s. By the 20th century it was a standard map in classrooms. Second, I learned about Mercator. He is known for the Mercator Projection Map and the atlas. Google Earth and similar software carry on Mercator’s legacy. Third, I learned about Tycho Brahe. He created a compromise model that preserved his biblical temptation. His Christian faith kept his work grounded in science. Lastly, I learned about the backstaff. It determines the sun’s altitude by casting a shadow as the marking line. It also helped English sailors colonize America.