ASP History of Astronomy

Question 1

Who published the heliocentric model of the solar system in his work 'De revolutionibus orbium coelestium' in 1543?

Accepted Answer

Nicolaus Copernicus

Answer

Nicolaus Copernicus published his heliocentric model placing the Sun at the center of the solar system in 1543, challenging the centuries-old geocentric view.

Question 2

Which ancient Greek astronomer developed the geocentric model with epicycles that dominated Western astronomy for over 1,400 years?

Accepted Answer

Claudius Ptolemy

Answer

Claudius Ptolemy codified the geocentric model in his 'Almagest' (~150 CE), using epicycles to explain planetary motion, and this system remained authoritative until Copernicus.

Question 3

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?

Accepted Answer

Johannes Kepler

Answer

Johannes Kepler used Tycho Brahe's precise data to formulate his three laws of planetary motion between 1609 and 1619, describing elliptical orbits.

Question 4

Which astronomer first used a telescope for systematic astronomical observations in 1609, discovering mountains on the Moon and moons orbiting Jupiter?

Accepted Answer

Galileo Galilei

Answer

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.

Question 5

Who first measured the speed of light in 1676 using timing discrepancies in the eclipses of Jupiter's moon Io?

Accepted Answer

Ole Rømer

Answer

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.

ASP - Astronomical Society of the Pacific Exam Practice Test

ASP - Astronomical Society of the Pacific Exam Practice Test

ASP History of Astronomy