The action of the first novel, “From the Earth to the Moon,” takes us to the 19th century. After the end of the American Civil War, one of the main characters, the chairman of the “Cannon Club”, Impey Barbicane, comes up with an unprecedented idea: he proposes, using contemporary scientific achievements, to put the destructive power of weapons to the benefit of humanity. According to his daring plan, three desperate researchers, located in a small capsule-projectile, must, by firing from a specially built cannon, overcome the force of gravity of the Earth and reach the natural satellite of the Earth - the Moon. In the second part of the book, there is a continuation of the novel “From the Earth to the Moon” - the novel “ Around the Moon." It tells the adventures of three intrepid travelers who venture into the previously unknown depths of space to reach the Moon. But soon the brave souls received very unpleasant news: for some unknown reason, the trajectory of the projectile changed, and it was now impossible to reach the surface of the Moon. Brave discoverers are in danger of becoming eternal inhabitants of the lunar orbit... In the novel “Upside Down”, members of the Cannon Club, trying to melt the polar ice, fire a shot from a giant cannon, but an error crept into the calculations... How could such a mathematician allow it? “J. T. Maston's absent-mindedness, a triple-zero error at the beginning of his calculations, was the cause of the humiliating failure of the new society. If the comrades of the unfortunate club secretary were indignant, then public opinion softened. In the end, it was thanks to his mistake that all the evil happened, or better yet, all the well-being..."