Warmingup、Pre-reading、Reading、Comprehending_第1页
Warmingup、Pre-reading、Reading、Comprehending_第2页
Warmingup、Pre-reading、Reading、Comprehending_第3页
Warmingup、Pre-reading、Reading、Comprehending_第4页
Warmingup、Pre-reading、Reading、Comprehending_第5页
已阅读5页，还剩25页未读， 继续免费阅读

下载本文档

版权说明：本文档由用户提供并上传，收益归属内容提供方，若内容存在侵权，请进行举报或认领

文档简介

高中英语课件 madeofcanruohanxing Sailingtheoceans warmingup 5minutes Sailing Question Howmanyoceansarethereintheworld PacificOcean AtlanticOcean IndianOcean ArcticOcean worldmapexploration compass Astrolabe 星盘 Sextant 六分仪 sea nauticalchart navigators earlynavigationalinstruments Whatisanavigator Whatisthedifferencebetweenanavigatorandanexplorer Anavigatorexploresnewroutesacrossthesea Anavigatorexploresthesea anexplorerdiscoversnewplacesonland ZhengHe Isheanavigatororanexplorer HemadesevenvoyagesduringhislifetimeandcontributedgreatlytothescienceofnavigationinChina ZhengHe MarcoPolo JamesCook Howdoyouthinkseamanfoundtheirwaybeforemodernaccuratemethodsofnavigationwereinvented Howdidtheynavigatesowell reading Readaboutwhatnavigationwaslikebeforemoderninstrumentswereused 25minutes Sailingtheoceans Fast readingtogetthegeneralidea Page1 10minutes Usingnature KeepingalongsidethecoastlineUsingcelestialbodiesUsingwildlifeUsingtheweatherUsingthesea 1minute Usingcelestialbodies toplotthepositions toworkoutthelatitude aspecialcloudformationindicatesthereislandcloseby 2minutes Usingwildlife Ifseaweedwasfreshandsmelledstrongly theshipwasclosetoland Seabirdscouldbeusedtoshowthewaytolandwhenitwasnowheretobeseen 1minute Usingtheweather fog Tohelpidentifythepositionofastreamorriverwhen Todirecttheirsailing 1minute Usetheinformationtoanalyzethenavigationalskillsandwritetheanswersinyourownwords Tofindtheship spositionatseaasailorused Asailorknewthatlandwasnearbyifhesaw Sailorsused toincreasetheirspeed theNorthStarandthesun seacurrentsortidesand winds Usingnature clouds freshseaweed nestingbirdsorfog 5minutes Fast readingtogetthegeneralidea thenanswerthequestions Page2 10minutes Usingnavigationalinstruments 1 Findinglongitude 2 Findinglatitude thecompass thebearingcircle 方位圆 theastrolabe 星盘 thequadrant 象限仪 四分仪 thesextant 六分仪 2minutes Readthepassageandanswerthefollowingquestions Whatistheuseofabearingcircle astrolabe quadrantorsextant Whatistheuseofacompass A tosetthecourseoftheshipB tomeasurethepositionoftheshipC tomeasurethespeedoftheshipD totellthetime B A Usinginstruments 2minutes Readagainandfillintheblanks Thereweretwomethodstofindlongitude 1 2 measuringtimeandspeed compassandcomplicated mathematicaltables Usinginstruments 1minute Writedowntheworkingprinciplesofthefollowinginstruments Bearingcircle Astrolabe Quadrant Sextant tocomparetheheightofthesunnowwiththepositionofthesunatmidday tocomparethepositionoftheshipinrelationtosomestarsorthesun amorepreciseformoftheastrolabe tomeasurehowhighstarsareabovethehorizon andcomparethatmeasurementwithpreviousmeasurements anupdatedversionofthequadrantandsoitwasmoreaccurate tomeasuretheanglebetweentowfixedpintsoutsidetheship 5minutes horizon Sunheight ABearingCircle Bearingthesun heightandazimuth Themarkswereusedtomeasuretheshadowofthesunanditsheightandpositioninthesky 方位 Listentothetapeandthenanswerthequestions Detailedreading Page2 5minutes 1 Whyarespeedandtimeimportantinworkingoutthelongitudeofaship Becausetheearthmovesfifteendegreeswestwardseveryhour Ifyouknowyourdirection speedandtime youcanworkouttheapproximatelongitude 2 Whyisthepositionofthesunandvariousstarsusefulforworkingoutlatitude Becausetheyarefixedpointsintheskyandtheirmovementsinrelationtotheeartharealreadyknown Sotheycanbeusedtomeasureaship sposition 10minutes discussion Whatwouldyoudoifyoucameacrossthefollowingproblemsduringyourvoyage waittillthestormisover andthenfindyournewpositionandreturntoyouroriginalcourse useknotstofindyourspeedandworkoutyourapproximatelongitude usethecompassandtheastrolabe quadrantorsextanttofindoutyourposition returntoyourformercourse follownestingbirdstoshore lookforspecialcloudformationsorfogoverstreamstofi
人人文库> 全部分类> 教育资料 > 课设设计

温馨提示

  • 1. 本站所有资源如无特殊说明，都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
  • 2. 本站的文档不包含任何第三方提供的附件图纸等，如果需要附件，请联系上传者。文件的所有权益归上传用户所有。
  • 3. 本站RAR压缩包中若带图纸，网页内容里面会有图纸预览，若没有图纸预览就没有图纸。
  • 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
  • 5. 人人文库网仅提供信息存储空间，仅对用户上传内容的表现方式做保护处理，对用户上传分享的文档内容本身不做任何修改或编辑，并不能对任何下载内容负责。
  • 6. 下载文件中如有侵权或不适当内容，请与我们联系，我们立即纠正。
  • 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

最新文档

评论

0/150

提交评论