{"title":"Astronomical imagery and numbers in mimbres pottery","authors":"R.Robert Robbins , Russell B. Westmoreland","doi":"10.1016/0364-9229(91)90017-F","DOIUrl":"10.1016/0364-9229(91)90017-F","url":null,"abstract":"","PeriodicalId":100136,"journal":{"name":"Astronomy Quarterly","volume":"8 2","pages":"Pages 65-88"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0364-9229(91)90017-F","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72937908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Hiawatha in California","authors":"Edwin C. Krupp (Director)","doi":"10.1016/0364-9229(91)90011-9","DOIUrl":"10.1016/0364-9229(91)90011-9","url":null,"abstract":"","PeriodicalId":100136,"journal":{"name":"Astronomy Quarterly","volume":"8 1","pages":"Pages 47-64"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0364-9229(91)90011-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82348027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Rationalist programmes in early modern cosmology","authors":"George Gale","doi":"10.1016/0364-9229(91)90002-3","DOIUrl":"10.1016/0364-9229(91)90002-3","url":null,"abstract":"","PeriodicalId":100136,"journal":{"name":"Astronomy Quarterly","volume":"8 4","pages":"Pages 193-218"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0364-9229(91)90002-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73196394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Skywatchers of the Salt River Valley Hohokam","authors":"Benjamin Mixon , Raymond E. White","doi":"10.1016/0364-9229(91)90004-5","DOIUrl":"10.1016/0364-9229(91)90004-5","url":null,"abstract":"","PeriodicalId":100136,"journal":{"name":"Astronomy Quarterly","volume":"8 4","pages":"Pages 245-259"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0364-9229(91)90004-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74856123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The happiest thought of Einstein's life","authors":"Michael Heller","doi":"10.1016/0364-9229(91)90022-D","DOIUrl":"10.1016/0364-9229(91)90022-D","url":null,"abstract":"<div><p>Finally, let us have a closer look at the place of the equivalence principle in the logical scheme of Einstein's general relativity theory.</p><p>First, Einstein new well, from Minkowski's geometric formulation of his own special relativity, that accelerated motions should be represented as curved lines in a flat space-time.</p><p>Second, the Galileo principle asserts that all bodies are accelerated in the same way in a given gravitational field, and consequently their motions are represented in the flat space-time by curved lines, all exactly in the same way.</p><p>Third, since all lines representing free motions are curved exactly in the same way in the flat space-time, one can say that the lines remain straight (as far as possible) but the space-time itself becomes curved.</p><p>Fourth, and last, since acceleration is (locally) equivalent to a gravitational field (here we have the equivalence principle), one is entitled to assert that it is the gravitational field (and not acceleration) that is represented as the curvature of space-time.</p><p>This looks almost like an Aristotelian syllogism. However, to put all the pieces of evidence into the logical chain took Einstein a few years of hard thinking. The result has been incorporated into the field equations which quantitatively show how the curvature of space-time and gravity are linked together.</p></div>","PeriodicalId":100136,"journal":{"name":"Astronomy Quarterly","volume":"8 3","pages":"Pages 177-180"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0364-9229(91)90022-D","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73901403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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