Warming up、Pre-reading、Reading、Comprehending课件配套优秀教案案例

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*归海木心*工作室的支持！敬请收藏：wrl6120.taobao.com Module 9 Unit 2 Sailing the oceans Discuss 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? Latitude, because it was used to measure how far you had traveled from land on a straight line. It was discovered a long time before 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 Comprehending 1. Read the passage and answer the following questions. What is the use of a bearing circle, astrolabe, quadrant or sextant? (

) B What is the use of a compass?

(

) A A. To set the course of the ship

B. To measure the position of the ship D. To tell the time [来源学科网]

C. To measure the speed of the ship

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 您的好评是对我们工作室的最大支持！

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*归海木心*工作室的支持！敬请收藏：wrl6120.taobao.com direction, speed and time, you can work out the approximate longitude or change in your position in relation to the stars.[来源:Zxxk.Com]

3) 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 passage again and use the information to analyze the navigational skills.

Using nature[来源:Zxxk.Com]

1. To find the ship’s position at sea a sailor used the North Star and the sun.

2. A sailor knew that land was nearby if he saw _____________________________. 3. Sailors used ________________________________to increase their speed.[来源:Zxxk.Com]

Keys:

fresh seaweed, nesting birds returning home in the evening or fog

Using instruments[来源:学科网ZXXK]

sea currents or tides and winds

4. There were two methods to find longitude:

1)_______________________

2)_______________________ Keys: measuring time and speed

compass and complicated mathematical tables

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