1. When does the Earth cast a round shadow on the surface of the Moon?
A. During solar eclipse
B. During lunar eclipse
C. During winter solstice
D. During summer solstice
2.What was not important in Eratosthenes's measurement of Earth's circumference?
A. The enormous size of the Sun
B. The number of degrees in a circle
C. The distance from Syene to Alexandria
D. The angle of a shadow cast by a vertical pole
3. Which of these pieces of evidences does not support the Greek's idea of a spherical Earth?
A. The North Star (Polaris) cannot be seen in the South Pole.
B. The sail disappears last when a ship sails away over the ocean.
C. The curvature of the Earth's surface causes the light rays to bend.
D. The Earth's shadow cast on the surface of the Moon is round during a lunar eclipse.
4. When did Eratosthenes observe a shadow cast by a vertical pole in Alexandria?
A. At noon during the winter solstice
B. At noon during the summer solstice
C. In the morning during the winter solstice
D. In the morning during the summer solstice
5. What is the circumference of the Earth according to Eratosthenes's calculation?
A. 230,000 stadia
B. 240,000 stadia
C. 250,000 stadia
D. 260,000 stadia
6. Where is Polaris located in the night sky when you are standing at the equator?
A. It's closer to the horizon.
B. It's 30 degrees above the ground.
C. It's in the middle of the sky or overhead.
D. It stays in its position wherever you observe it in the night sky.
7. Which of the following describes the position of Polaris if you travel closer to the North Pole?
A. It gradually disappears.
B. It stays closer to the horizon.
C. It doesn't change its position in the night sky.
D. It seems to rise higher and higher in the night sky
8. What is the equivalent value of Eratosthenes calculation of the Earth's circumference in kilometers?
A. 30 000 kilometers
B. 40 000 kilometers
C. 50 000 kilometers​