,高中英语课件,madeofcanruohanxing,高中英语课件madeofcanruohanxing,Sailing the oceans,Sailing the oceans,warming up,(5 minutes),warming up(5 minutes),Sailing,Sailing,Question:How many,oceans,are there in the world?,Pacific Ocean,Atlantic Ocean,Indian Ocean,Arctic Ocean,Question:How many oceans,world map exploration,world map exploration,Write down the words you know,which are related to,navigation,and,sea,.,Write down the words you know,navigation,sail,sailor,voyage,latitude,longitude,equator,horizon,captain,land island,nautical middles,explore,exploration,navigationsail,sailor,voyage,sea,seaman,seaweed,seafood,shore,offshore,onshore,beach,beach-ball,seabed,sea-bird,seagull,sea shell,seaside,sea water,seasick,coast,coastline,tide,wave,current,seaseaman,seaweed,seafood,s,Pre-reading,(5 minutes),Pre-reading(5 minutes),compass,Astrolabe,(,星盘,),Sextant,(,六分仪,),sea/nautical chart,navigators,early navigational instruments,compassAstrolabe(星盘)Sextant(六分,What is a,navigator,?,What is the difference between a navigator and an explorer?,A navigator explores new routes,across the sea,.,A navigator explores the sea;an,explorer,discovers new places,on land,.,What is a navigator?A navigato,Zheng He,Is he a navigator or an explorer?,Zheng HeIs he a navigator or a,He,made seven voyages,during his lifetime and contributed greatly to the science of navigation in China.,He made seven voyages during h,Zheng He,Marco Polo,James Cook,How do you think seaman found their way before modern accurate methods of navigation were invented?,How did they navigate so well?,Zheng HeMarco PoloJames CookHo,reading,Read about what navigation was like before modern instruments were used.,(25 minutes),readingRead about what navigat,Sailing the oceans,Fast-reading,to get the general idea.,Page 1,(10 minutes),Sailing the oceans Fast,Using nature,Keeping alongside the coastline,Using celestial bodies,Using wildlife,Using the weather,Using the sea,(1 minute),Using nature Keeping alongsid,Using celestial bodies,to plot the positions,to work out the latitude,a special cloud formation indicates there is land close by,(2 minutes),Using celestial bodiesto plot,Using wildlife,If seaweed was fresh and smelled strongly,the ship was close to land.,Sea birds could be used to show the way to land when it was nowhere to be seen.,(1 minute),Using wildlifeIf seaweed was,Using the weather,fog,To help identify the position of a stream or river when,To direct their sailing,(1 minute),Using the weatherfogTo help i,.Use the information to analyze the navigational skills and write the answers in your own words.,To find the ships position at sea a sailor used _.,A sailor knew that land was nearby if he saw_ _.,Sailors used _ _ to increase their speed.,the North Star and the sun.,sea currents or tides and,winds,Using nature,clouds,fresh seaweed,nesting birds or fog,(5 minutes),.Use the information to analy,Fast-reading,to get the general idea.,then answer the questions.,Page 2,(10 minutes),Fast-reading Page 2(10 minute,Using navigational instruments,1.Finding longitude,2.Finding latitude,the compass,the bearing circle,(,方位圆,),the astrolabe,(,星盘,),the quadrant,(,象限仪,四分仪,),the sextant,(,六分仪,),(2 minutes),Using navigational instrumen,Read the passage and answer the following questions.,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,B,A,Using instruments,(2 minutes),Read the passage and answer th,Read again and fill in the blanks,There were two methods to find longitude:1._,2._,measuring time and speed,compass and complicated,mathematical tables,Using instruments,(1 minute),Read again and fill in the bla,Write down the,working principles,of the following instruments:,Bearing circle,:,Astrolabe:,Quadrant:,Sextant:,to compare the height of the sun now with the position of the sun at midday.,to compare the position of the ship in relation to some stars or the sun.,a more precise form of the astrolabe,to measure how high stars are above the horizon,and compare that measurement with previous measurements.,an updated version of the quadrant and so it was more accurate,to measure the angle between tow fixed pints outside the ship.,(5 minutes),Write down the working princip,horizon,Sun height,A Bearing Circle,Bearing the sun-height and azimuth,(The marks were used to measure the shadow of the sun and its height and position in the sky.),(,方位,),horizonSun heightA Bearing Cir,Listen to the tape and then answer the questions,Detailed reading,Page 2,(5 minutes),Listen to the tape and then an,1.Why are speed and time important in working 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.,1.Why are speed and time impo,2.Why is the position of the sun and various stars useful for working out latitude?,Be