Unit 4 Notes: Understanding the Scientific Revolution (AP European History)

Scientific Revolution

A major sixteenth- and seventeenth-century shift in European understanding of nature that emphasized systematic observation, measurement, experimentation, and mathematical reasoning over reliance on ancient authorities and tradition.

Authority (in premodern natural philosophy)

The idea that truth about nature should primarily come from respected sources (especially ancient texts like Aristotle) and established institutions, rather than being tested against new evidence.

Method (scientific context)

The procedures used to produce and validate knowledge, increasingly centered on observation, measurement, experimentation, and mathematical reasoning during the Scientific Revolution.

Aristotelian worldview

A traditional framework taught in European universities that shaped explanations of nature (physics and philosophy of nature) and was increasingly challenged by new observations and methods.

Ptolemaic astronomy

The dominant traditional model of the cosmos that treated Earth as central and used complex geometrical adjustments to match observed planetary motion.

Geocentric model

An astronomical model that places Earth stationary at the center of the cosmos.

Heliocentric model

An astronomical model that places the Sun at the center of planetary motion; associated with Copernicus.

Systematic observation

Disciplined, repeatable observation designed to reduce error and bias, often supported by instruments and careful record-keeping.

Measurement

Quantifying natural phenomena to enable precise comparison, testing, and prediction—central to the new standards of proof.

Experimentation

Testing nature through structured procedures (often with controlled conditions) to identify cause-and-effect relationships.

Universal laws of nature

Rules believed to apply everywhere in nature, replacing case-by-case explanations with general principles.

Mathematics as the language of nature

The Scientific Revolution idea that mathematical description and prediction provide especially credible explanations of natural phenomena.

Mechanistic worldview

The view that the universe operates like a machine governed by consistent, discoverable principles rather than by irregular or purely purpose-based explanations.

Empiricism

The belief that knowledge of the natural world should be grounded in experience—especially observation and experiment—and be open to replication and checking by others.

Controlled variables

A core feature of experimentation: holding factors constant so a test can more confidently identify what caused an observed outcome.

Inductive reasoning

Reasoning that builds general principles from repeated observations (pattern → rule).

Deductive reasoning

Reasoning that starts with principles and derives predictions to test against observation (rule → expected pattern).

Model-testing (evidence over tradition)

The Scientific Revolution attitude that if observations conflict with a model, the model must be revised—models must answer to evidence.

Nicolaus Copernicus

The thinker who proposed a heliocentric model (Earth rotates and revolves around the Sun), published in 1543 in On the Revolutions of the Heavenly Spheres.

Retrograde motion (as reframed by heliocentrism)

The apparent backward movement of planets, explained in a heliocentric model as a perspective effect caused by Earth’s motion relative to other planets.

Galileo Galilei

A key figure who used telescope-aided observation and arguments about motion to challenge Aristotelian-Ptolemaic claims and defend heliocentrism, raising conflicts over authority.

Phases of Venus (Galileo)

Telescopic observations showing Venus displays a full range of phases, supporting the idea that Venus orbits the Sun and serving as model-testing evidence.

Moons of Jupiter (Galileo)

Galileo’s observation of satellites orbiting Jupiter, undermining the assumption that all celestial bodies revolve around Earth.

Isaac Newton

The scientist whose synthesis (especially in the 1687 Principia Mathematica) united terrestrial and celestial physics through laws of motion and universal gravitation.

Universal gravitation

Newton’s principle that the same force governs falling objects on Earth and planetary motion in the heavens, supporting the idea that one set of laws applies everywhere.