Warming up、Pre-reading、Reading、Comprehending教学设计实例

选修9 Unit 2Warming up, Pre-reading, Reading, Comprehending 教学设计

Warming up

The four basic instruments for navigation: Sinan, Inch Astrolabe, Sextant and nautical map.

Pre-reading Discussion：

1.

How do you think seamen found their way before modern accurate methods of navigation were invented? Kept close to the shore, used nature such as the sun, wind, birds, tide, etc, to help them, and used some of the instruments including a compass, astrolabe, etc.

2. Which do you think was easier to work out: latitude or longitude?

3. Can you identify these early navigational instruments seamen used and explain how they are used?

1) compass ( in ancient China)

2) astrolabe

3) sextant

4) sea / nautical / marine chart

4. Which ones do you think are still used

today?

Sea charts are still used today. Reading

Read and answer these questions.

1. Where do these materials come from?

2. What did the early navigator use to help them navigate?

3. What natural objects were used to assist the navigation?

4. Is it easier to measure longitude or latitude?

5. Do the astrolabe, the quadrant and the sextant mean the same thing?

Comprehending 1. Read the passage and answer the following questions.

1)

What is the use of a bearing circle,

astrolabe, quadrant or sextant? (

)

What is the use of a compass?

(

)

A. To set the course of the ship

B. To measure the position of the ship

C. To measure the speed of the ship

D. To tell the time

2) Why are speed and time important in working out the longitude of a ship?

Speed and time are important in finding out the longitude of a ship because the earth moves fifteen degrees westwards every hour. If you know your direction, speed and time, you can work out the approximate longitude or change in your position in relation to the stars.

) Why is the position of the sun and various stars useful for working out latitude?

The position of the sun and stars are useful for working out latitude because they are fixed points in the sky and their movements in relation to the earth are already known. So they can be used to measure a ship's position.

2. Suppose you were a sea captain aiming to sail round Africa. Discuss in groups:

1) What skills would you seek in your sailors?

2) What problems would you anticipate for this journey?

3. Read the chart below and fill in your plans of action to deal with them.

4. Read the passage again and use the information to analyze the navigational skills.

Read the passage (Reading) and decide whether the following statements are true (T) or false (F).

1. An early method of calculating longitude was to use a knotted rope tied to a log.

2. The astrolabe was the first instrument to measure the sun’s position.

3. The quadrant was more precise and simplified than the astrolabe, but still had its shortcoming.

Homework: 1. Review this passage.

2. Preview Learning about

language.