From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, HTML_MESSAGE,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 23529 invoked from network); 9 Sep 2021 01:48:02 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 9 Sep 2021 01:48:02 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id B6BB69C8E4; Thu, 9 Sep 2021 11:48:01 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id D9D919BB67; Thu, 9 Sep 2021 11:47:53 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=bsdimp-com.20150623.gappssmtp.com header.i=@bsdimp-com.20150623.gappssmtp.com header.b="nMOKyFTR"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id B37F09BB67; Thu, 9 Sep 2021 11:47:51 +1000 (AEST) Received: from mail-vs1-f54.google.com (mail-vs1-f54.google.com [209.85.217.54]) by minnie.tuhs.org (Postfix) with ESMTPS id D3AD99BB66 for ; Thu, 9 Sep 2021 11:47:49 +1000 (AEST) Received: by mail-vs1-f54.google.com with SMTP id p14so246231vsm.2 for ; Wed, 08 Sep 2021 18:47:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=vYWpuVK3FVwDgY4wdOayhramtI+dawrl8yCc51qvFbA=; b=nMOKyFTRzMcJf41imjo6BFDaXoJsBdWxQUzIC0ZvhOhPGX8PT5Ep9oPGccpogvsFbM 5sM/MGT6EZHnUU7BH1O9AhuvAKqx3Y0B5IDF8h+H7c6YgHqFR2QG5wtJ25rz8IaB14ik 1AeBbxZgAUWLo0zT6tO/QDgK4IYO5eHFbtvJ8dgRmVYkP4pJe6o2btFIHQk1HdBDJkzB YVBZzI6OhwoHmFRxKHjwwYr88EZUfU/749lsrVQvMt7dE0QQl2YqtmGAVxQYiCEshilb L5Ib/CNoAuVnzM4mw/r6NuP6kHeblx0gw8+IXwTHiGUlRijg8tK1IdaP+eS6o26BgVf9 /NEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=vYWpuVK3FVwDgY4wdOayhramtI+dawrl8yCc51qvFbA=; b=QN+tYflw2+4O/fcfHqlwB0vuWPuofmQx/nVimrL/rOj23vyOJtNXnMxvaB1JrAekjs rvpCQWDBNkhszHZyct3K/mKV9PYgJl4FRvMx3dX9iuhNkGtrI1IKvzu2RkQs3YzVssU9 rIeW6bCHfL+c8R/PODTi/WSvAuWPoQNEzJUr1S7lJPVGMr4lakxw2np3RCFRpD88xJRx Qo9dtK6Dt/rlHGiL7C5qM8EeZCkVPVx5V8cqBpraokZ827vZi5hznJUd53WUx8pm0Xgg W+QF5xBf7WRlvl1hl8OfFGsJRzpvKDWJEvu5S9Gc77DEiBmqV8aJlVYjWjkj6r34bu1E WGjQ== X-Gm-Message-State: AOAM5313NS9uo6UWaGZBGQIWh5r3oeV7ezqHO2PRIrx1eezHfcFxMSql rcRijLZmc1RqZmlKYmowTMzNt2gX6NBkmHMB1mzzPggXSrU= X-Google-Smtp-Source: ABdhPJxbEJIUpBGZO/i8Zty0Ff40Ld3TfqqxR6DXCVi3QfkxnwVXqPx6AH6I0fc6+jP7IuCcIVUsEO1am1O7gED+t/8= X-Received: by 2002:a67:e253:: with SMTP id w19mr222018vse.30.1631152068612; Wed, 08 Sep 2021 18:47:48 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Warner Losh Date: Wed, 8 Sep 2021 19:47:36 -0600 Message-ID: To: Adam Thornton Subject: Re: [COFF] What does your "cal" show? (fwd) X-BeenThere: coff@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Computer Old Farts Forum List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Computer Old Farts Followers Content-Type: multipart/mixed; boundary="===============0583841334934983604==" Errors-To: coff-bounces@minnie.tuhs.org Sender: "COFF" --===============0583841334934983604== Content-Type: multipart/alternative; boundary="0000000000009fea5205cb862ffa" --0000000000009fea5205cb862ffa Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, Sep 8, 2021, 7:34 PM Adam Thornton wrote: > Just variation of Earth=E2=80=99s rotational speed over time, AFAIK. > > http://leapsecond.com/java/gpsclock.htm -- TAI is SI second ticks, UTC is > corrected to rotation by leap seconds. Currently they are 37 seconds apa= rt. > UTC is also SI seconds with an extra second inserted so celestial mean noon doesn't drift. It's irregular as to when based on the irregular wobble of the earth. Warner Adam > > On Sep 8, 2021, at 6:22 PM, Dave Horsfall wrote: > > Ah, leap seconds. I work for an observatory. Some things are in TAI and > some are in UTC. At least now I know what to look for when something is = 37 > seconds off. > > > Isn't about that the transit of the Moon or something? > > -- Dave_______________________________________________ > COFF mailing list > COFF@minnie.tuhs.org > https://minnie.tuhs.org/cgi-bin/mailman/listinfo/coff > > > _______________________________________________ > COFF mailing list > COFF@minnie.tuhs.org > https://minnie.tuhs.org/cgi-bin/mailman/listinfo/coff > --0000000000009fea5205cb862ffa Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Wed, Sep 8, 2021, 7:34 PM Adam Thornton <athornton@gmail.com> wrote:
Just variation of Earth= =E2=80=99s rotational speed over time, AFAIK.

http://leapsecond.com/java/gpsclock.htm -- TAI is SI second ti= cks, UTC is corrected to rotation by leap seconds.=C2=A0 Currently they are= 37 seconds apart.
UTC is also SI seconds with an extra second inser= ted so celestial mean noon doesn't drift. It's irregular as to when= based on the irregular wobble of the earth.

Warner

Adam

= On Sep 8, 2021, at 6:22 PM, Dave Horsfall <dave@horsfall.org> wrot= e:

Ah, leap seconds.=C2=A0 I w= ork for an observatory.=C2=A0 Some things are in TAI and some are in UTC.= =C2=A0 At least now I know what to look for when something is 37 seconds of= f.

Isn't about that the transit of the Moon or some= thing?

-- Dave_______________________________________________
COF= F mailing list
COFF@minnie.tuhs.org
https://minnie.tuhs.org/cgi-bin/mailman/listinfo/coff
<= /blockquote>

_______________________________________________
COFF mailing list
COFF@minnie.tuhs.org
https://minnie.tuhs.org/cgi-bin/mail= man/listinfo/coff
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