Podcast
Questions and Answers
Why did Aristotle believe that the earth was spherical?
Why did Aristotle believe that the earth was spherical?
- Because the moon shines only by reflected sunlight.
- Because Alexandria and Syene have different angles of sun rays.
- Because the earth tilts on its axis, causing seasonal variations.
- Because the moon casts a curved shadow during a lunar eclipse. (correct)
What was Anaxagoras' explanation for the phases of the moon?
What was Anaxagoras' explanation for the phases of the moon?
- He proposed a system of fixed spheres for celestial bodies.
- The moon shines only by reflected sunlight. (correct)
- Because the light rays from the sun are parallel.
- He believed the Earth was the center of the universe.
Which Greek astronomer believed that the planets and stars were concentric, crystalline spheres centered on the Earth?
Which Greek astronomer believed that the planets and stars were concentric, crystalline spheres centered on the Earth?
- Anaxagoras
- Aristarchus
- Eudoxus
- Aristotle (correct)
What was the significance of the Sun's angle of 7.2° in Alexandria and 0° in Syene?
What was the significance of the Sun's angle of 7.2° in Alexandria and 0° in Syene?
Why did Eudoxus propose a system of fixed spheres for celestial bodies?
Why did Eudoxus propose a system of fixed spheres for celestial bodies?
Which Greek astronomer was the first to profess the heliocentric view?
Which Greek astronomer was the first to profess the heliocentric view?
What is observed during a lunar eclipse that led the Greeks to conclude the Earth is a sphere?
What is observed during a lunar eclipse that led the Greeks to conclude the Earth is a sphere?
Why does the position of the North Star appear different depending on the observer's location?
Why does the position of the North Star appear different depending on the observer's location?
What is common to the Moon and the Sun?
What is common to the Moon and the Sun?
What is the optical illusion that occurs when a sailing ship disappears over the horizon?
What is the optical illusion that occurs when a sailing ship disappears over the horizon?
Why do the positions of the stars appear to shift depending on the observer's location?
Why do the positions of the stars appear to shift depending on the observer's location?
What is the main indicator that the Earth is a sphere?
What is the main indicator that the Earth is a sphere?
What is observed during a lunar eclipse that suggests the Earth is spherical?
What is observed during a lunar eclipse that suggests the Earth is spherical?
What is an optical illusion that occurs when ships sail over the horizon?
What is an optical illusion that occurs when ships sail over the horizon?
What is the significance of the North Star in ancient astronomy?
What is the significance of the North Star in ancient astronomy?
What is the term for the astronomical model where the Earth and planets revolve around the Sun?
What is the term for the astronomical model where the Earth and planets revolve around the Sun?
What is the longest and shortest day of the year marked by?
What is the longest and shortest day of the year marked by?
Who is credited with proposing a spherical Earth?
Who is credited with proposing a spherical Earth?
