'''Tempus Atomicum Internationale''' (TAI) est [[regula temporis]] [[Coordinata temporis|coordinata]] atomica maxime accurata, radicata ex [[Tempus rectarectum|tempore rectarecto]] transeundo in [[geoides|geoide]] [[Tellus (planeta)|Telluris]]. Est modus primus [[Tempus Terrenum|Temporis Terreni]], et radix [[UTC|Temporistemporis Universalumuniversalis Coordinaticoordinati]] (UTC), quod utuntur ad tempus curandum per omnem superfaciem Telluris. Anno 2009, TAI accurate erat 34 secundis ante UTC: incepto anni 1972, discrepantia erat 10 secundi, additus ad 24 [[Secundum intercalarium|secunda intercalaria]] in UTC post annum 1972; novissimum secundum intercalarium additus est die 31 Decembris 2008.<ref>{{cite web|title=Resolution B1 on the use of Julian dates|url=http://www.iers.org/nn_10382/IERS/EN/Science/Recommendations/resolutionB1.html|accessdate=21 Iul 2010|date=1 Ian 2001|publisher=International Earth Rotation and Reference Systems Service|language=Anglice}}</ref><ref>{{cite web|url=http://tf.nist.gov/pubs/bulletin/leapsecond.htm|title=NIST Time Scale Data Archive|publisher=NIST|language=Anglice|accessdate=21 Iul 2010|date=25 Feb 2010}}</ref>
