Final answer:
Ptolemy's geocentric model made important contributions to our understanding of the solar system.
Step-by-step explanation:
Ptolemy, an ancient astronomer, made significant contributions to our understanding of the solar system with his geocentric model, which predicted the positions of the planets for any desired date and time. Although his concept of the world was later proven incorrect by Copernicus' heliocentric theory, we remember Ptolemy for his mathematical and observational achievements. His model served as a basis for further research and influenced the development of astronomy for over 1,200 years, making him a noteworthy figure in the history of science.