Étienne Léopold Trouvelot's "Total eclipse of the sun: Observed July 29, 1878, at Creston, Wyoming Territory." Trouvelot travelled to the remote outpost to view the eclipse as part of an official party from the US Naval Observatory. [New York Public Library Digital Collections]

Trouvelot's "The planet Mars: Observed September 3, 1877, at 11h. 55m. P.M." Almost 100 years later, in July 1976, NASA's Viking 1 became the first spacecraft to successfully land and operate on the Red Planet. [New York Public Library Digital Collections]

Trouvelot's illustration "The planet Saturn: Observed on November 30, 1874, at 5h. 30m. P.M." shows the planet's rings, which are comprised of billions of icy particles. [New York Public Library Digital Collections]

Trouvelot's "Group of sun spots and veiled spots: Observed on June 17th 1875 at 7 h. 30 m. A.M." The French artist and astronomer is credited with discovering "veiled spots" on the Sun. [New York Public Library Digital Collections]

Trouvelot's "The great nebula in Orion: From a study made in the years 1875-76." Situated in the constellation of Orion and visible to the naked eye, the diffuse nebula is the central 'star' in the sword of Orion. [New York Public Library Digital Collections]

Trouvelot's "The planet Jupiter: Observed November 1, 1880, at 9h. 30m. P.M." shows the planet's Great Red Spot. Astronomers have since learned that the spot is a massive, high-pressure anticyclonic storm. [New York Public Library Digital Collections]

Trouvelot's "Star clusters in Hercules. From a study made in June, 1877," shows the stars of the Hercules Cluster, 25,000 light-years from Earth. [New York Public Library Digital Collections]

Trouvelot's illustration "Mare Humorum: From a study made in 1875" shows a large, basaltic plain on Earth's Moon, formed by lava flowing into ancient impact basins. [New York Public Library Digital Collections]