Editing ΔT (timekeeping) (section)

== Current values ==
Recall {{math|1=Δ''T'' = TT − UT1}} by definition. While [[Terrestrial Time|TT]] is only theoretical, it is commonly realized as [[International Atomic Time|TAI]] + 32.184 seconds where TAI is [[Coordinated Universal Time|UTC]] plus the current leap seconds, so {{math|1=Δ''T'' = UTC − UT1 + (leap seconds) + 32.184 s}}.

This can be rewritten as {{math|1=Δ''T'' = (leap seconds) + 32.184 s &minus; DUT1}}, where [[DUT1]] is UT1 &minus; UTC. The value of DUT1 is sent out in the weekly [[IERS]] [https://datacenter.iers.org/data/latestVersion/bulletinA.txt Bulletin A], as well as several [[time signal service]]s, and by extension serve as a source of the current {{math|1=Δ''T''}}.