History of Astronomy Flashcards
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Read the first 7 History of Astronomy flashcards as text
Who published the heliocentric model of the solar system in his work 'De revolutionibus orbium coelestium' in 1543?
Answer: Nicolaus Copernicus
Nicolaus Copernicus published his heliocentric model placing the Sun at the center of the solar system in 1543, challenging the centuries-old geocentric view.
Which ancient Greek astronomer developed the geocentric model with epicycles that dominated Western astronomy for over 1,400 years?
Answer: Claudius Ptolemy
Claudius Ptolemy codified the geocentric model in his 'Almagest' (~150 CE), using epicycles to explain planetary motion, and this system remained authoritative until Copernicus.
Tycho Brahe's meticulous naked-eye observations of planetary positions were inherited and used by which astronomer to derive the three laws of planetary motion?
Answer: Johannes Kepler
Johannes Kepler used Tycho Brahe's precise data to formulate his three laws of planetary motion between 1609 and 1619, describing elliptical orbits.
Which astronomer first used a telescope for systematic astronomical observations in 1609, discovering mountains on the Moon and moons orbiting Jupiter?
Answer: Galileo Galilei
Galileo Galilei turned a telescope toward the sky in 1609, making discoveries including lunar craters, Jupiter's four largest moons, and phases of Venus that supported heliocentrism.
Who first measured the speed of light in 1676 using timing discrepancies in the eclipses of Jupiter's moon Io?
Answer: Ole Rømer
Ole Rømer observed that eclipses of Io occurred earlier or later than predicted depending on Earth's position relative to Jupiter, correctly attributing the discrepancy to light travel time.
Isaac Newton's 'Principia Mathematica,' published in 1687, introduced which concept that unified terrestrial and celestial mechanics?
Answer: Universal gravitation
Newton's 'Principia Mathematica' introduced the law of universal gravitation, showing that the same force governing falling objects on Earth also governs the orbits of planets.
Which ancient Greek scholar first estimated Earth's circumference with remarkable accuracy around 240 BCE by comparing shadow angles in Syene and Alexandria?
Answer: Eratosthenes
Eratosthenes measured the angle of the Sun's shadow in Alexandria when it cast no shadow in Syene on the summer solstice, calculating Earth's circumference to within a few percent of the modern value.