Answer: Qualitative
Let's start by explaining the difference between the qualitative and quantitative method:
The qualitative method is based on the observable information and the opinion that refers to it, hence it is in the subjective field. While the quantitative method relies on the information derived from numbers and deductions, it is information that can be measured and calculated, therefore it is objective.
In this sense, Aristotle mistakenly thought the Earth was the center of the universe, thus establishing a geocentric cosmological model. He did this based purely on observations and philosophical assumptions, not on measurements or calculations, therefore his predictions of heavenly motion were qualitative.