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Llínea 19: − + + − * [https://library.si.edu/digital-library/book/annualreportofbo18861smit Fleming, Sandford (1886). «Time-reckoning for the twentieth century». Annual Report of the Board of Regents of the Smithsonian Institution (1): 345-366. Reprinted in 1889: 'Time-reckoning for the twentieth century']
→Referències
== Referències ==
== Referències ==
* [https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat «Bulletin C». International Earth Rotation and Reference Systems Service]
* [https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat «Bulletin C». International Earth Rotation and Reference Systems Service]
* Chester, Geoff (15 de junio de 2015). «Wait a second... 2015 will be a little longer». CHIPS: The Department of the Navy's Information Technology Magazine. Department of the Navy.
* Chester, Geoff (15 de junio de 2015). «Wait a second... 2015 will be a little longer». CHIPS: The Department of the Navy's Information Technology Magazine. Department of the Navy
* [https://library.si.edu/digital-library/book/annualreportofbo18861smit Fleming, Sandford (1886). «Time-reckoning for the twentieth century» Annual Report of the Board of Regents of the Smithsonian Institution (1): 345-366. Reprinted in 1889: 'Time-reckoning for the twentieth century']
* [http://maia.usno.navy.mil/ser7/tai-utc.dat «History of TAI-UTC». Time Service Dept., U.S. Naval Observatory. c. 2009]
* [http://maia.usno.navy.mil/ser7/tai-utc.dat «History of TAI-UTC». Time Service Dept., U.S. Naval Observatory. c. 2009]
== Bibliografia ==
== Bibliografia ==