Emmanuel Liais was a French astronomer and mathematician born on March 24, 1826. He is best known for his work in celestial mechanics and for his contributions to the study of planetary motion. Liais also played a significant role in the development of the Paris Observatory, where he conducted various astronomical observations. In addition to his scientific work, Liais was an advocate for the popularization of science. He wrote several articles and books aimed at making complex astronomical concepts accessible to the general public. His efforts helped to inspire interest in astronomy and contributed to the advancement of the field during the 19th century.