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1860 - 1938
Aymar Eugene de La Baume Pluvinel (1860–1938) was a French astronomer noted for his pioneering work in astrophotography and spectroheliography. Educated at the École Polytechnique, he became a central figure in France’s late 19th- and early 20th-century astronomical expeditions, particularly those aimed at observing total solar eclipses. Pluvinel made significant advances in photographing the solar corona and prominences, and he collaborated with fellow astronomers to improve spectrographic techniques for studying the Sun’s atmosphere. He was actively involved in the French eclipse expeditions to the Caribbean, Spain, and North Africa, producing some of the earliest high-quality images of solar phenomena.
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1795 - 1874
Philippe Gustave le Doulcet, Comte de Pontécoulant (1795–1874) was a French astronomer and mathematician best known for his extensive theoretical work on celestial mechanics. Born into an aristocratic family, he studied at the École Polytechnique in Paris, where he developed a strong foundation in mathematics and physics. Pontécoulant authored the multi-volume Théorie Analytique du Système du Monde (1829–1846), which elaborated and extended the work of Laplace, offering detailed mathematical treatments of planetary motions, lunar theory, and perturbations. His calculations and analytical methods contributed to more precise ephemerides and a deeper understanding of gravitational interactions in the Solar System.
Gustave de Pontécoulant full name is Philippe Gustave le Doulcet de Pontécoulant (1795–1874). He was a notable French astronomer and mathematician. He used mathematical methods developed by Poisson and Lagrange to predict the return of Halley's Comet with great precision in 1829. His calculations for the perihelion passage were accurate to within two days. He also published several works on celestial physics, including "Théorie Analytique du Système du Monde" and "Traité élémentaire de Physique Céleste." Philippe Gustave le Doulcet, Comte de Pontécoulant, was a member of the French Academy of Sciences and had a significant impact on the field of astronomy.
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1882 - 1955
Eugène Joseph Delporte (10 January 1882 – 19 October 1955) was a Belgian astronomer based at the Royal Observatory of Belgium, well known for his contributions to asteroid discovery and for his role in defining modern constellation boundaries. Over his career, he discovered 66 asteroids, including notable ones such as 1221 Amor, the first of the Amor group of near-Earth asteroids, and 2101 Adonis. In 1930, the International Astronomical Union tasked Delporte with formalizing the boundaries of the 88 modern constellations along lines of right ascension and declination for the epoch 1875.0, work which remains the standard today. His precise mapping brought consistency to astronomical charts worldwide. Delporte’s meticulous approach to positional astronomy and his asteroid discoveries made him an important figure in 20th-century observational astronomy.
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