[LEAPSECS] Leap second to be introduced at midnight UTC December 31 this year

Richard Langley lang at unb.ca
Mon Jul 25 09:02:13 EDT 2016

Folks at the National Research Council in Ottawa responsible for CHU's broadcast have said that they would change the format for DUT1 should there be a change in the definition of UTC (or whatever a possible new time scale might be called).
-- Richard Langley

| Richard B. Langley                            E-mail: lang at unb.ca         |
| Geodetic Research Laboratory                  Web: http://gge.unb.ca      |
| Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142   |
| University of New Brunswick                   Fax:      +1 506 453-4943   |
| Fredericton, N.B., Canada  E3B 5A3                                        |
|        Fredericton?  Where's that?  See: http://www.fredericton.ca/       |

From: LEAPSECS <leapsecs-bounces at leapsecond.com> on behalf of Tony Finch <dot at dotat.at>
Sent: Monday, July 25, 2016 6:37 AM
To: Tom Van Baak; Leap Second Discussion List
Subject: Re: [LEAPSECS] Leap second to be introduced at midnight UTC    December 31 this year

Tom Van Baak <tvb at LeapSecond.com> wrote:

> > Isn't the limit on DUTC 0.9s? So you can't have a leap second at the end
> > of the month when | UT1 - UTC | < 0.1
> Right, for LSEM to work, you'd have to extend the DUT1 limit a bit
> beyond 0.9s. Historically, DUT1 has changed from 0.1s to 0.5s to 0.7s to
> 0.9s, so I doubt 1.1s or 2.0s would be the showstopper.

As I understand it the problem with |DUT1| > 0.9s is to do with radio
signal compatibility, e.g. MSF only allows |DUT1| <= 0.8s +/- 0.05s


f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/  -  I xn--zr8h punycode
Fisher, German Bight: South veering west or southwest, 3 or 4, increasing 5 at
times. Smooth becoming slight, occasionally moderate later in Fisher. Showers,
fog patches at first. Moderate or good, occasionally very poor at first.
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