Who was the German mathematician who used Tycho Brahe’s data to come up with hisown heliocentric model of the universe?

The German mathematician who used Tycho Brahe's data to come up with his own heliocentric model of the universe was Johannes Kepler.

Here are the steps he took:

1. Johannes Kepler was an assistant to Tycho Brahe, a Danish nobleman who was known for his accurate and comprehensive astronomical and planetary observations.

2. After Brahe's death, Kepler inherited his data, which was the most precise at the time.

3. Kepler used this data to develop his own mathematical models. After failing to make the data fit with circular orbits, he tried using an elliptical orbit model.

4. This led to his first law of planetary motion, also known as the law of ellipses, which states that planets move in elliptical orbits with the sun at one focus.

5. He later developed two additional laws of planetary motion, which together with his first law, accurately described the motion of planets around the sun.

6. These laws were a major contribution to the scientific revolution and helped to lay the groundwork for the development of Newton's theory of gravity.