03 The Scientific Revolution

A changing approach to nature

The Scientific Revolution was a broad transformation in the study of nature, especially in sixteenth- and seventeenth-century Europe. It was not a sudden break or the invention of one universal scientific method. Instead, new approaches to inquiry built on earlier learning and developed alongside religious and political change.

Evidence, reasoning, and experiment

Natural philosophers increasingly tested claims against evidence from the natural world instead of relying only on ancient texts or abstract argument. Francis Bacon urged investigators to collect observations systematically and use them to develop general conclusions, a process known as induction. Galileo Galilei combined observation and experiment with mathematical analysis, arguing that nature’s patterns could be described mathematically.

These approaches did not amount to one procedure followed by every investigator. Reasoning, observation, and experimentation could work together, and instruments and experiments raised questions about how observations should be interpreted and verified.

Instruments and shared inquiry

New instruments extended the reach of observation. The telescope helped astronomers study the heavens, while the microscope revealed structures too small to see unaided. Microscopes and other instruments also widened investigation in fields such as anatomy and natural history.

In 1660, English natural philosophers formed the group that became the Royal Society. Members shared observations, conducted demonstrations, discussed results, and published findings. Its motto, Nullius in verba—often translated as “take nobody’s word for it”—expressed the value of testing claims rather than accepting authority alone. The Society’s journal, Philosophical Transactions, began publication in 1665.

Changing models of the cosmos

Astronomy brought the most visible challenge to the inherited picture of the cosmos. Nicolaus Copernicus proposed a Sun-centered arrangement of the planets, though his model retained important older assumptions. Tycho Brahe made exceptionally precise astronomical observations, and Johannes Kepler used such data to show that planets move in elliptical rather than perfect circular orbits.

In 1610, Galileo reported telescopic observations, including moons orbiting Jupiter. These observations challenged the idea that every celestial body revolved around Earth.

Motion and shared physical principles

In Principia Mathematica (1687), Isaac Newton brought developments in astronomy and motion together. His laws of motion and theory of universal gravitation explained the motion of planets and the motion of objects on Earth through the same mathematical principles. Nature increasingly appeared to many investigators as a system whose regular patterns could be measured and explained.

New explanations of the body

The study of living bodies also changed. Drawing on dissection, observation, and experiments, William Harvey argued in De Motu Cordis (1628) that the heart pumps blood around the body in a continuous circulation. His account challenged long-standing medical ideas and showed how evidence could revise accepted explanations.

Changing standards and continuing debates

These developments weakened the assumption that inherited authorities supplied the final answers about nature. Mathematical laws, repeatable observations, and experimental evidence became increasingly important standards for evaluating explanations. The idea that Earth occupied a unique central position in the cosmos gave way to a larger, more complex universe; Newton’s synthesis suggested that the heavens and Earth obeyed common physical principles.

These changes did not mean that Europeans simply abandoned religion. Many natural philosophers were religious and often understood the investigation of nature as compatible with belief in a creator. However, new discoveries could conflict with established interpretations, producing disputes over who had authority to explain the natural world.

Scientific ideas circulated through books, correspondence, and learned societies, contributing to a culture of inquiry that helped shape later Enlightenment thought.