Jean Philippe Loys de Chéseaux was an 18th-century Swiss astronomer and mathematician, born in 1718. He is best known for his work in observational astronomy and for his contributions to the understanding of comets. Chéseaux was particularly interested in the study of the comet that appeared in 1744, which he meticulously observed and documented. In addition to his astronomical pursuits, Chéseaux was a member of the Royal Society and contributed to various scientific discussions of his time. He published several works, including a notable treatise on the nature of light and its properties. Chéseaux passed away in 1751, leaving a legacy in the field of astronomy.