Jonathan Swift in Gulliver's Travels , makes reference to two moons of Mars.
"The astronomers on the flying island of Laputia, have ... discovered two lesser stars, or satellites, which revolve around Mars, whereof the innermost is distant from the center of the primary exactly three of his diameters, and the outermost five: the former revolves in the space of ten hours, and the latter in twenty-one and a half. "
The number of moons is correct.The moons were not discovered 1877 - 151 years later.
He places them in close proximity to the planet, which they are.
The moons were not discovered 1877 - 151 years later.
The moons of Mars, Phobos and Deimos, were discovered in 1877 by Asaph Hall, Sr. This was 151 years after Swift wrote Gulliverís Travels.
Swift is believed to have based his two Martian moons on a hypothesis made earlier by the German astronomer Kepler, while the accuracy of orbital details are written off by rigid thinkers as shear luck.