Teaching chart drawn and printed by Leighton Brothers and published by John Betts, London, England around 1850. The astronomical diagram shows the orbits of the planets along with the path followed by comets. Four small inset figures explain the phases of the Moon, solar and lunar eclipses, the causes of season and the relative size and appearance of the planets. The chart does not include the planet Pluto, which was only discovered in 1930, nor Neptune that was found a few years earlier in 1846 at the Berlin Observatory by the astronomers Gottfried Galle and Heinrich d'Arrest.
© Science Museum / Science & Society Picture Library