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1、AShortGuidetoCelestialNavigationCopyright©1997-2006HenningUmlandAllRightsReservedRevisedApril10th,2006FirstPublishedMay20th,1997LegalNotice1.LicenseandOwnershipThepublicationAShortGuidetoCelestialNavigationisownedandcopyrightedbyHenningUmland,©Copyright1997-2006,allrightsreserved.Igr
2、anttheuserafreenonexclusivelicensetodownloadsaidpublicationforpersonaloreducationaluseaswellasforanylawfulnon-commercialpurposesprovidedthetermsofthisagreementaremet.Todeploythepublicationinanycommercialcontext,eitherin-houseorexternally,youmustobtainawrittenpermissionfromtheauthor.2
3、.DistributionYoumaydistributecopiesofthepublicationtothirdpartiesprovidedyoudonotdosoforprofitandeachcopyisunalteredandcomplete.Extractinggraphicsand/orpartsofthetextisprohibited.3.WarrantyDisclaimerIprovidethepublicationtoyou"asis"withoutanyexpressorimpliedwarrantiesofanykindincludi
4、ng,butnotlimitedto,anyimpliedwarrantiesoffitnessforaparticularpurpose.Idonotwarrantthatthepublicationwillmeetyourrequirementsorthatitiserror-free.Youassumefullresponsibilityfortheselection,possession,anduseofthepublicationandforverifyingtheresultsobtainedbyapplicationofformulas,proce
5、dures,diagrams,orotherinformationgiveninsaidpublication.January1,2006HenningUmlandFelixquipotuitbonifontemviserelucidum,felixquipotuitgravisterraesolverevincula.BoethiusPrefaceWhyshouldanybodystillpracticecelestialnavigationintheeraofelectronicsandGPS?Onemightaswellaskwhysomephotogra
6、phersstilldevelopblack-and-whitephotosintheirdarkroominsteadofusingahigh-colordigitalcamera.Theanswerwouldbethesame:becauseitisanobleart,andbecauseitisrewarding.Nodoubt,aGPSnavigatorisapowerfultool,butusingitbecomesroutineverysoon.Incontrast,celestialnavigationisanintellectualchallen
7、ge.Findingyourgeographicpositionbymeansofastronomicalobservationsrequiresknowledge,judgement,andskillfulness.Inotherwords,youhavetouseyourbrains.EveryonewhoeverreducedasightknowsthethrillIamtalkingabout.Thewayisthegoal.Ittookcenturiesandgenerationsofnavigators,astronomers,geographers
8、,mathematici
