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We show how to obtain these periods from Newton's laws with a precision greater than 0.02% using only the sidereal month and year as references.<\/jats:p>","DOI":"10.1590\/s1806-11172009000100003","type":"journal-article","created":{"date-parts":[[2011,4,15]],"date-time":"2011-04-15T14:29:30Z","timestamp":1302877770000},"page":"1303.1-1303.6","source":"Crossref","is-referenced-by-count":1,"title":["The Saros cycle: obtaining eclipse periodicity from Newton's laws"],"prefix":"10.1590","volume":"31","author":[{"given":"Fabio A.C.C.","family":"Chalub","sequence":"first","affiliation":[{"name":"Universidade Nova de Lisboa,  Portugal"}]}],"member":"530","reference":[{"key":"ref1","series-title":"Cambridge Dictionary of Astronomy","author":"Mitton J.","year":"2001"},{"key":"ref2","series-title":"Stonehenge Decoded","author":"Hawkins G.","year":"1965"},{"key":"ref3","doi-asserted-by":"crossref","first-page":"306","DOI":"10.1038\/200306a0","volume":"200","author":"Hawkins G.","year":"1963","journal-title":"Nature","ISSN":"http:\/\/id.crossref.org\/issn\/0028-0836","issn-type":"print"},{"key":"ref4","doi-asserted-by":"crossref","first-page":"125","DOI":"10.1119\/1.10975","volume":"45","author":"Manning R.","year":"1977","journal-title":"Am. 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