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高中英语 Unit2Sailing the oceansTextbook课件 新人教选修9.ppt

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Inpairsdiscussthesequestions:1Whatisanavigator?Anavigatorexploresnewroutesacrossthesea.2Whatisthedifferencebetweenanavigatorandanexplorer?Anavigatorexploresthesea;anexplorerdiscoversnewplacesonland.3Lookatthesefamouspeople.Aretheynavigatorsorexplorers?Whatdoyouknowaboutthem?NavigatorseanauticalinstrumentsfindnewislandsorcontinentsNavigatorissomeonewhofindsthepositionandplotsthecourseofashipanaircraftacaretcusingmapsandinstruments.ExplorerlanduseofcompassandlandmarksfindnewplaceswithinanalreadyidentifiedislandorcontinentExplorerissomeonewhotravelsintoorthroughaplaceinordertolearnaboutit.Veryoftennavigatorsarealsoexplorers.Lookatthepictures.Thenanswerthequestions.1Howdoyouthinkseamenfoundtheirwaybeforemodernaccuratemethodsofnavigationwereinvented?Keptclosetotheshoreusednaturesuchasthesunwindbirdstideetctohelpthemandusedsomeoftheinstrumentsincludingacompassastrolabeetc.2Whichdoyouthinkwaseasiertoworkout:latitudeorlongitude?Latitudebecauseitwasusedtomeasurehowfaryouhadtravelledfromlandonastraightline.Itwasdiscoveredalongtimebeforelongitude.3Canyouidentifytheseearlynavigationalinstrumentsseamenusedandexplainhowtheyareused?1_________________________2_________3_________4________________________4Whichonesdoyouthinkarestillusedtoday?Seachartsarestillusedtoday.Readthepassageandanswerthefollowingquestions.1Whatistheuseofabearingcircleastrolabequadrantorsextant?()Whatistheuseofacompass?()AtosetthecourseoftheshipBtomeasurethepositionoftheshipCtomeasurethespeedoftheship