《大学英语精读》课程教学资源（PPT课件讲稿）Unit 3 Why Do We Believe That the Earth Is Round

Unit 3 Why Do We Believe That the earth Is Round Warm-Up Activity Can you prove that the earth is round? Go ahead and try! Will you rely on your senses or will you have to draw on the opinions of experts?

Unit 3 Why Do We Believe That the Earth Is Round Warm-Up Activity: Can you prove that the earth is round? Go ahead and try! Will you rely on your senses or will you have to draw on the opinions of experts?

Back Ground Information George bernard Shaw George bernard Shaw °(1856-1950), rih playwright, critic and novelist F is widely considered the greatest British dramatist since Shakespeare, and the greatest British satirist since swift

Back Ground Information • George Bernard Shaw: • George Bernard Shaw • (1856-1950), Irish playwright, critic and novelist, is widely considered the greatest British dramatist since Shakespeare, and the greatest British satirist since Swift

Shaw's plays often ridicule governmental or social hypocrisies of mock the conventions of polite society. In the long prefaces to the printed editions he aired his views on all sorts of subjects. In 1925 he was awarded the Nobel Prize for Literature. Among his most famous plays are Widowers Houses. Mrs. Warren's Profession, Arms and the man, Man and Superman, Major Barbara, Pygmalion and Saint Joan

• Shaw’s plays often ridicule governmental or social hypocrisies of mock the conventions of polite society. In the long prefaces to the printed editions he aired his views on all sorts of subjects. In 1925 he was awarded the Nobel Prize for Literature. Among his most famous plays are Widowers’ Houses. Mrs. Warren’s Profession, Arms and the Man, Man and Superman, Major Barbara, Pygmalion and Saint Joan

The Round Earth Theory In the Sixth century BC The Greek Philosopher Pythagoras(毕达哥拉斯) Believed that the earth was a sphere because he considered this the most perfect of shapes, not from any scientific considerations

• The Round Earth Theory • In the Sixth century B.C., • The Greek Philosopher • Pythagoras (毕达哥拉斯）Believed • that the earth was a sphere because he • considered this the most perfect of shapes, not from any scientific considerations

In the fourth century BC both plato and aristotle believed that the earth was spherical (Plato) (Aristotle) Plato, like Pythagoras, accepted this shape because it is the most perfect, but Aristotle relied more strongly on the evidence of the senses: the earth's shadow, during a lunar eclipse, is round

• In the fourth century B.C., • both Plato and Aristotle • believed that the earth • was spherical. (Plato) (Aristotle) • Plato, like Pythagoras, accepted this shape because it is the most perfect, but Aristotle relied more strongly on the evidence of the senses: the earth’s shadow, during a lunar eclipse, is round

In 1521, the Portuguese navigator Magellan's voyage around the world proved that the earth was round 母 平录 (麦哲伦航船复制品) (麦哲伦环球航线图)

In 1521, the Portuguese navigator Magellan’s voyage around the world proved that the earth was round. (麦哲伦航船复制品） （麦哲伦环球航线图）

The Flat Earth Theory During the Middle Ages, clergymen denounced the spherical theory of the earth and a flat disc with jerusalem at the center was the only orthodox concept

• The Flat Earth Theory • During the Middle Ages, clergymen denounced the spherical theory of the earth and a flat disc with Jerusalem at the center was the only orthodox concept

The real shape of the earth Strictly speaking, the earth is not perfectly round. It is slightly flattened at the poles and has a bulge(an outward swelling )at the equator( an imaginary line around the earth exactly halfway between the poles In recent years, scientists have learned that there is another very small bulge at the North Pole. They say, therefore, that the earth is somewhat pear-shaped

• The Real Shape of the Earth • Strictly speaking, the earth is not perfectly round. It is slightly flattened at the poles and has a bulge (an outward swelling) at the equator ( an imaginary line around the earth exactly halfway between the poles). In recent years, scientists have learned that there is another very small bulge at the North Pole. They say, therefore, that the earth is somewhat pear-shaped

Eclipses In astronomy the word eclipse is used to describe two different things: an eclipse of the sun or an eclipse of the moon. An eclipse of the sun is called a solar eclipse. It occurs when the moon passes directly in front of the sun. As seen from various points on the earth, the moon blocks out the sun (Solar Eclipse Explanation) (Solar Eclipse Captured)

• Eclipses • In Astronomy the word “eclipse” is used to describe two different things: an eclipse of the sun or an eclipse of the moon. An eclipse of the sun is called a solar eclipse. It occurs when the moon passes directly in front of the sun. As seen from various points on the earth, the moon blocks out the sun. • (Solar Eclipse Explanation) (Solar Eclipse Captured)

Lunar Eclipse An eclipse of the moon is called a lunar eclipse. It occurs when the full moon passes behind the earth into the earths shadow within the shadow the moon is no longer directly lighted by the sun Moon p Sun Explanation Lunar Eclipses

• Lunar Eclipse • An eclipse of the moon is called a lunar eclipse. It occurs when the full moon passes behind the earth into the earth’s shadow. Within the shadow the moon is no longer directly lighted by the sun. • Explanation Lunar Eclipses