UT1

It was recently attached to UT1, one of the four eight-meter mirrors of the Very Large Telescope array atop the mountain nearby.

First Contact Marc Kaufman 2011

Currently, BIPM calculates UTC based on an average of measurements from 400 atomic clocks around the world and UTC never differs from the time defined by the rotation of the Earth UT1 by more than .9 seconds due to "leap seconds."

World Time Changing? Coordinated Universal Time (UTC) May Eliminate "Leap Seconds" In 2012 2011

It was recently attached to UT1, one of the four eight-meter mirrors of the Very Large Telescope array atop the mountain nearby.

First Contact Marc Kaufman 2011

VLTs 8m scopes UT1 thru UT4 are now known as Antu, Kueyen, Melipal and Yepun.

Armazones Chile to be the Site for the 42 meter European Extremely Large Telescope? | Universe Today 2010

The IFJ's observer reported that journalists at rival television channel Inter UT1 have also walked out to join the so-called "orange revolution" - the 200,000 people on the streets protesting that the election was rigged.

12thharmonic Blog weezil 2010

UTC is "regularly adjusted by introducing a leap second based on the accumulated difference between the atomic clock time (TAI) and UT1, the time reflecting the Earth's rotational speed," Oracle said.

Techworld.com News 2009

UTC is "regularly adjusted by introducing a leap second based on the accumulated difference between the atomic clock time (TAI) and UT1, the time reflecting the Earth's rotational speed," Oracle said.

Techworld.com News 2009

UTC is "regularly adjusted by introducing a leap second based on the accumulated difference between the atomic clock time (TAI) and UT1, the time reflecting the Earth's rotational speed," Oracle said.

Techworld.com News 2009

But, due to the shifts in Earth's rotational rate, and a gradual slowing of Earth's rotation due to gravitational interactions, a slight discrepancy arises between UT1 and UTC.

Astroprof's Page 2009

To differentiate the two, we use UT1 to designate Universal Time and UTC to designate Coordinated Universal Time.

Astroprof's Page 2009