Gravitation; an elementary explanation of the principal perturbations in the solar system
An elementary treatise on planetary and lunar perturbation by the Astronomer Royal George Biddell Airy, published by Macmillan in London in 1884 for general readers without mathematics. The figures are spare line diagrams: lettered ellipses and circles crossed by radiating rays, tangents and chords, usable as clean geometric marks, orbital motifs, or schematic line patterns.
