ARLA/CLUSTER: Um segundo extra vai ser acrescentado à Hora UTC no ultimo dia de Junho de 2015

[João Costa > CT1FBF]

Extra second to be added to Coordinated Universal Time (UTC)

The International Earth Rotation and Reference Systems Service (IERS)
has announced at the Paris Observatory, in a bulletin addressed to the
'authorities responsible for the measurement and distribution of time'
that it will be giving us 'more time.'

The bulletin advises authorities an extra second will be introduced to
Coordinated Universal Time (UTC) during the final minute, of the final
day of June. That means that right after the clock hits "23h 59m 59s,"
it will strike "23h 59m 60s" UTC.

Another way to think about it:
Instead of the about 86,400 seconds we normally experience in a day,
we're getting 86,401.

This "leap second" system started in 1972, so our clocks stay in sync
with how long it takes the Earth to rotate on its axis. "Leap seconds
ensure that, on average, the Sun continues to be overhead on the
Greenwich meridian at noon to within about one [second]."

IERS already has added 25 leap seconds to Coordinated Universal Time
-- most recently in June 2012.

Leap seconds can only be added in June and December.

International Business Times
http://www.ibtimes.com/extra-leap-second-will-be-added-clocks-june-30-1774068