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Add 1 book for Wikipedia:Pemastian (20230709)) #IABot (v2.0.9.5) (GreenC bot |
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<ref name=IERS>{{cite web|author=Staff|date=2007-08-07|url=http://hpiers.obspm.fr/eop-pc/models/constants.html|title=Useful Constants|publisher=[[International Earth Rotation and Reference Systems Service]]|accessdate=2008-09-23}}</ref>
<ref name=seidelmann1992>{{cite book|last1=Seidelmann|first1=P. Kenneth|year=1992|title=Explanatory Supplement to the Astronomical Almanac|url=https://archive.org/details/explanatorysuppl0003unse|page=[https://archive.org/details/explanatorysuppl0003unse/page/n79 48]|publisher=University Science Books|location=Mill Valley, CA|isbn=0-935702-68-7}}</ref>
<ref name=iers1623>{{cite web|author=Staff|url=http://hpiers.obspm.fr/eop-pc/earthor/ut1lod/lod-1623.html|title=IERS Excess of the duration of the day to 86400s ... since 1623|publisher=International Earth Rotation and Reference Systems Service (IERS)|accessdate=2008-09-23|archive-date=2008-10-03|archive-url=https://web.archive.org/web/20081003083543/http://hpiers.obspm.fr/eop-pc/earthor/ut1lod/lod-1623.html|dead-url=yes}}—Graph at end.</ref>
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