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dc.contributor.authorGoodwin, David
dc.date.available2017-12-14T03:15:51Z
dc.date.copyright2017-09
dc.identifier.citationGoodwin, D., 2017. Precession Issues in Polynesian Archaeoastronomy. Journal of the Polynesian Society, 126(3), pp.337-352.en_NZ
dc.identifier.urihttp://hdl.handle.net/10523/7784
dc.description.abstractLatitude and azimuth determination were crucial for Polynesian navigators, supplemented by techniques such as observations of swells, birds and expanded landfalls. Longitude could only be determined by dead reckoning. Both latitude and azimuth made extensive use of stars, which alter gradually over the centuries due to precession, the movement in the Earth’s axis of spin. Knowledge about the effects of precession can assist scholars in weighting one voyaging date higher than another, or in providing possible reasons why certain voyages took place in a particular era if navigation methods depended on star configurations that were particularly favourable in that era. The influence of precession on stars used for different methods of latitude determination is not intuitive. In this article a graph of the change in declination per century as a function of right ascension is proposed as a way of understanding the influence of precession on different methods of latitude and azimuth determination, and of deducing when and where significant configurations occur.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoenen_NZ
dc.publisherUniversity of Aucklanden_NZ
dc.relation.ispartofJournal of the Polynesian Societyen_NZ
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectPolynesian navigationen_NZ
dc.subjectArchaeoastronomyen_NZ
dc.subjectZenith starsen_NZ
dc.subjectStar pillarsen_NZ
dc.subjectStar compassen_NZ
dc.subjectPrecessionen_NZ
dc.titlePrecession Issues in Polynesian Archaeoastronomyen_NZ
dc.typeJournal Articleen_NZ
dc.date.updated2017-12-14T00:06:31Z
otago.schoolSurveyingen_NZ
otago.relation.issue3en_NZ
otago.relation.volume126en_NZ
dc.identifier.doihttp://dx.doi.org/10.15286/jps.126.3.337-352en_NZ
otago.bitstream.endpage352en_NZ
otago.bitstream.startpage337en_NZ
otago.openaccessOpenen_NZ
dc.description.refereedPeer Revieweden_NZ
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Attribution-NonCommercial-NoDerivatives 4.0 International
Except where otherwise noted, this item's licence is described as Attribution-NonCommercial-NoDerivatives 4.0 International