Copernican model was applicable for

Options

A. Circular orbits
B. Elliptical orbits
C. Partabolic orbits
D. Undefined paths

Answer

### Step-by-Step Solution:

1. **Identify the Scientist and Model**: The question refers to the Copernican model, which was proposed by Nicolaus Copernicus.

2. **Understand the Nature of the Model**: The Copernican model is primarily known for introducing the heliocentric theory, which places the Sun at the center of the universe with planets, including Earth, orbiting around it.

3. **Determine the Type of Orbits**: The Copernican model specifically described the orbits of planets as circular. This was a significant shift from the earlier geocentric models that placed Earth at the center.

4. **Evaluate the Options**: The options provided include circular orbits, elliptical orbits, parabolic orbits, and undefined. Based on the historical context of Copernicus's work, we can conclude that the model was applicable to circular orbits.

5. **Final Conclusion**: Therefore, the Copernican model was applicable for circular orbits of planets around the Sun.

### Final Answer:
The Copernican model was applicable for circular orbits.

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