# Category:Time scales

Wikimedia Commons has media related to .Spans of time |

## Pages in category "Time scales"

The following 33 pages are in this category, out of 33 total. This list may not reflect recent changes (learn more).

the entire wiki with video and photo galleries

find something interesting to watch in seconds

find something interesting to watch in seconds

Jump to navigation
Jump to search

## Pages in category "Time scales"

Wikimedia Commons has media related to .Spans of time |

The following 33 pages are in this category, out of 33 total. This list may not reflect recent changes (learn more).

RELATED RESEARCH TOPICS

1. DUT1 – The time correction DUT1 is the difference between Universal Time, which is defined by Earths rotation, and Coordinated Universal Time, which is defined by a network of precision atomic clocks. DUT1 = UT1 − UTC UTC is maintained via leap seconds, forecast values of DUT1 are published by IERS Bulletin A. Weekly updated values of DUT1 with 0.1 s precision are broadcast by several time signal services, including WWV and these services transmit one pulse per second of some sort. To represent positive DUT1 values from +0.1 to +0.8 seconds, the number of emphasized pulses gives the value of DUT1. Negative DUT1 values, from −0.1 to −0.8 seconds, are represented by emphasizing pulses 9 through 16. For example, a DUT1 value of −0.4 would be transmitted by emphasizing pulses 9 through 12, the Russian time signal RWM transmits an additional correction dUT1 in 0.02 s increments. Positive values of dUT1 from +0.02 to +0.08 s are encoded by emphasizing pulses 21 through 24, the actual value of DUT1 is approximated by the sum of the transmitted DUT1 + dUT1. The longwave RBU time signal also transmits dUT1, iTU-R Recommendation TF. 460-4, Standard-frequency and time-signal emissions. IERS Rapid Service/Prediction Center http, //scienceworld. wolfram. com/astronomy/Time. html http, //maia. usno. navy. mil/ser7/deltat. data