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WikiPedia: ΔT http://user.online.be/felixverbelen/dt.htm http://books.google.com/books?id=j8MRAAAAYAAJ&pg=P... http://books.google.com/books?id=uJ4JhGJANb4C&prin... http://www.leapsecond.com/history/1968-Metrologia-... http://adsabs.harvard.edu/abs/1948AJ.....53..169C http://articles.adsabs.harvard.edu/cgi-bin/nph-iar... http://articles.adsabs.harvard.edu/full/1927BAN...... http://articles.adsabs.harvard.edu/full/1971JHA...... http://maia.usno.navy.mil/ http://maia.usno.navy.mil/ser7/historic_deltat.dat...