Paral·lel 31° nord: diferència entre les revisions
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{{Referències|refs=
<ref name="nga">{{ref-web | url = http://msi.nga.mil/MSISiteContent/StaticFiles/Calculators/degree.html | títol = Length of a Degree of Latitude and Longitude | editor = [[National Geospatial-Intelligence Agency]] | consulta = 2018-05-25 | arxiuurl = https://www.webcitation.org/6DzvTFimc?url=http://msi.nga.mil/MSISiteContent/StaticFiles/Calculators/degree.html | arxiudata = 2013-01-28}}</ref>
<ref name="aa_usno">{{ref-web | url = http://aa.usno.navy.mil/data/docs/Dur_OneYear.php | títol = Duration of Daylight/Darkness Table for One Year | editor = Astronomical Applications Department of the U.S. Naval Observatory | consulta = 2018-05-25 | arxiuurl = https://web.archive.org/web/20191012094319/http://aa.usno.navy.mil/data/docs/Dur_OneYear.php | arxiudata = 2019-10-12 }}</ref>
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