This is a vintage scientific illustration, likely from a book, demonstrating the shape of the Earth through observations of lunar eclipses. It's a series of diagrams arranged in rows, each row presenting a different hypothetical shape for the Earth and its resulting shadow during a lunar eclipse. The top row shows a spherical Earth with a circular shadow cast on the moon during an eclipse. The diagram includes a small depiction of a person observing the eclipse and a label indicating 'DAY'. The subsequent rows each depict a different geometric shape for the Earth – a triangle, a square, and a hexagon – and the corresponding shadow that would be cast on the moon if that shape were true. Each diagram shows the Earth, the sun, the moon, and light rays illustrating how the shadow would form. The shadows are, predictably, triangular, square, and hexagonal, respectively. Below each diagram is a Latin phrase and its English translation, explaining the hypothesis being presented. The final row shows a square Earth with a round shadow, and the text notes that the shadow appears round even if the Earth were square. The style of the illustration is detailed and precise, with fine lines and shading. The overall impression is one of scientific inquiry and a desire to understand the natural world through observation and reasoning.