Io Flashcards
What is the geocentric model?
The Earth is the center of the universe.
What is the heliocentric model?
The Sun is the center of the universe.
Who is known as the father of modern astronomy?
Galileo Galilei.
What did Eudoxus contribute to astronomy?
He proposed features of the celestial sphere.
What is the Ptolemaic model?
It describes apparent retrograde motion of planets.
What did Tycho Brahe study?
He made precise observations of stars.
What is a solar eclipse?
A phenomenon where the Moon blocks the Sun.
What is a lunar eclipse?
An event that helps understand the Earth’s shadow.
What is Kepler’s first law?
The orbit of a planet is an ellipse with the Sun at one focus.
Who proposed a revolutionary idea about the solar system?
Copernicus.
What does ‘annual’ mean?
Yearly.
What does ‘diurnal’ mean?
Daily.
What is a shadow in observational astronomy?
An observation of light blockage.
What did Eratosthenes measure?
He calculated the circumference of the Earth.
What are equinoxes?
Two days in a year when day and night are equal.
What is the significance of Aristotle’s observations?
He proposed that the Earth has a spherical shape.
What does it mean when the Sun is directly aligned?
It relates to lunar eclipses.
What did Aristotle propose about the Earth?
He suggested that the Earth has five spheres.
Who proposed that the Sun is the center of the universe?
Aristarchus.
What is natural motion?
Movement that does not require force.
What is violent motion?
Any motion that requires force.
What is the role of force in motion?
Force is needed to change the state of motion.
What is the significance of Tycho Brahe’s observations?
He made the most accurate observations of his time.
