Rudolf Wolf was a notable Swiss astronomer born on March 18, 1816. He is best known for his work on sunspots and solar activity. Wolf developed the Wolf number, a system for quantifying sunspot activity, which is still used today to study the solar cycle. In addition to his contributions to solar research, Wolf was involved in various scientific organizations and published numerous papers. His work laid the foundation for understanding the relationship between solar activity and climate changes on Earth, influencing future studies in both astronomy and meteorology.