人教版高中英语选修九Unit2Readingppt课件.pptx

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(金戈铁骑整理制作)
Reading
广东曾桂萍刘玉
Module9
Unit2Sailingtheoceans
Discuss
?
Keptclosetotheshore,usednaturesuchasthesun,wind,birds,tide,etc,tohelpthem,andusedsomeoftheinstrumentsincludingacompass,astrolabe,etc.
:latitudeorlongitude?
Latitude,.
?
1)compass(inancientChina)
2)astrolabe
3)sextant
4)sea/nautical/marinechart

today?
Seachartsarestillusedtoday.
Comprehending
.
Whatistheuseofabearingcircle,
astrolabe,quadrantorsextant?()
Whatistheuseofacompass?()




A
B
2)Whyarespeedandtimeimportantinworkingoutthelongitudeofaship? ,speedandtime,youcanworkouttheapproximatelongitudeorchangeinyourpositioninrelationtothestars.
3)Whyisthepositionofthesunandvariousstarsusefulforworkingoutlatitude?
'sposition.
:
1)Whatskillswouldyouseekinyoursailors?
2)Whatproblemswouldyouanticipateforthisjourney?