When does the Earth cast a round shadow on the surface of the Moon?

• During solar eclipse

• During lunar eclipse

• During winter solstice

• During summer solstice

Which of these pieces of evidences does not support the Greek's idea of a spherical Earth?

• The North Star (Polaris) cannot be seen in the South Pole.

• The sail disappears last when a ship sails away over the ocean.

• The curvature of the Earth's surface causes the light rays to bend.

• The Earth's shadow cast on the surface of the Moon is round during a lunar eclipse.

Where is Polaris located in the night sky when you are standing at the equator?

• It's closer to the horizon.

• It's 30 degrees above the ground.

• It's in the middle of the sky or overhead.

• It stays in its position wherever you observe it in the night sky.

How did ancient people make use of their observations in the sky?

• They used it to plan for war and conquer new lands.

• They used it to entertain themselves during the night.

• They used it to predict their future and make stories of heroes.

• They used it for telling time, navigation, agriculture, and religious practices.

Which astronomical phenomena was used as the basis of creating ancient calendars?

• Phases of the Moon

• Occurrence of comets

• Appearance of eclipses

• Changing positions of the constellations

Which astronomical phenomena signifies incoming catastrophes for ancient people?

• Motion of planets

• Appearance of comets

• Occurrence of eclipses

• Phases of the Moon

Which among the following statements is CORRECT about the law of ellipses?

• Planets move in a circular orbit with the sun at the center.

• Planets move in an elliptical orbit with the sun as one of the foci.

• The period and the average distance are related by two-thirds power.

• The line joining the sun and the planet sweeps equal areas in equal times as the planet revolves around the sun.

Which law of planetary motion states that planets sweep equal areas of their orbit over equal time intervals?

• Law of ellipses

• Law of equal areas

• Law of periods

• Law of gravity

That the square of the orbital period of a planet is proportional to the cube of the mean distance from the sun is the statement of which law of planetary motion?

• Law of ellipses

• Law of equal areas

• Law of periods

• Law of gravity

Which law states that an object at rest stays at rest and an object in motion stays in motion with the same speed and direction unless acted upon by an unbalanced force?

• Law of Inertia

• Law of Interaction

• Law of Acceleration

• Law of Gravitation