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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="color:black">From: </span>
</b><span style="color:black">"Christian.Stangl@dlr.de" <Christian.Stangl@dlr.de><br>
<b>Date: </b>Tuesday, February 5, 2019 at 3:06 AM<br>
<b>To: </b>Peter Shames <Peter.M.Shames@jpl.nasa.gov>, "Erika.Sanchez@jhuapl.edu" <Erika.Sanchez@jhuapl.edu><br>
<b>Cc: </b>"osvaldo.peinado@dlr.de" <osvaldo.peinado@dlr.de><br>
<b>Subject: </b>AW: SEA-Time telecon minutes<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:#1F497D">Dear Erika and Peter,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:#1F497D">I have some input for the definition sections of “CCSDS_Time_definitions - 22Jan19.docx”:</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l2 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:11.0pt;color:#1F497D">§2.7: The term “clock synchronization” is still open or misleading compared to “time synchronization” of §2.8<br>
in my opinion a clock synchronization – when it is not understood with time sync according §2.8 – could be more a “clock adjustment” e.g. where we adjust the drift of a S/C based oscillator due to aging process or radiation in space. Also the adjustment of
the offset when it’s a clock based on an epoch</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l2 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:11.0pt;color:#1F497D">§2.3: I miss the term “epoch” as the reference date for time measurement. We should also list the examples like GPS (1980-01-06T00:00:00) and the UNIX Time Scale (1970-01-01T00:00:00)</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l2 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:11.0pt;color:#1F497D">When speaking from Time scales, TAI, GPS, UTC and time itself the leap seconds become important; there I always find the input of
<a href="http://leapsecond.com">http://leapsecond.com</a> very helpful ;-)<br>
On <a href="http://leapsecond.com/java/gpsclock.htm">http://leapsecond.com/java/gpsclock.htm</a> they show a very nice and short definition of different time scales to avoid confusion of terms like “time”, the “epoch” of a “time scale” etc:</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.5in;text-indent:-.25in;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b><span style="font-family:"Times New Roman",serif">Local</span></b><span style="font-family:"Times New Roman",serif"> time is the date/time reported by your PC (as seen by your web browser). If your PC clock is accurate to a
second then the other time scales displayed above will also be accurate to within one second.
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.5in;text-indent:-.25in;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b><span style="font-family:"Times New Roman",serif">UTC</span></b><span style="font-family:"Times New Roman",serif">, Coordinated Universal Time, popularly known as GMT (Greenwich Mean Time), or
<i>Zulu</i> time. Local time differs from UTC by the number of hours of your timezone.
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.5in;text-indent:-.25in;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b><span style="font-family:"Times New Roman",serif">GPS</span></b><span style="font-family:"Times New Roman",serif">, Global Positioning System time, is the atomic time scale implemented by the atomic clocks in the GPS ground
control stations and the GPS satellites themselves. GPS time was zero at 0h 6-Jan-1980 and since it is not perturbed by leap seconds GPS is now ahead of UTC by 18 seconds.
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.5in;text-indent:-.25in;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b><span style="font-family:"Times New Roman",serif">Loran-C</span></b><span style="font-family:"Times New Roman",serif">, Long Range Navigation time, is an atomic time scale implemented by the atomic clocks in Loran-C chain transmitter
sites. Loran time was zero at 0h 1-Jan-1958 and since it is not perturbed by leap seconds it is now ahead of UTC by 27 seconds.
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.5in;text-indent:-.25in;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b><span style="font-family:"Times New Roman",serif">TAI</span></b><span style="font-family:"Times New Roman",serif">, Temps Atomique International, is the international atomic time scale based on a continuous counting of the
SI second. TAI is currently ahead of UTC by 37 seconds. TAI is always ahead of GPS by 19 seconds.
</span><span style="font-size:11.0pt;color:#1F497D"><br>
<br>
<br>
</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l2 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:11.0pt;color:#1F497D">The selection of their links (of leapsecond.com) may be also very helpful, but some are deprecated like the link to our (German) PTB which operates German Time Reference</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l2 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:11.0pt;color:#1F497D">Regarding the term “Sun barycenter” I find following definition helpful (source:
<a href="https://tycho.usno.navy.mil/systime.html">https://tycho.usno.navy.mil/systime.html</a>):</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.5in"><span style="font-family:Symbol">·</span><span style="font-family:"Times New Roman",serif">
<b>Dynamical Time</b> replaced <i>ephemeris time</i> as the independent argument in dynamical theories and ephemerides. Its unit of duration is based on the orbital motions of the Earth, Moon, and planets.
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:2.0in;text-indent:-.25in;mso-list:l0 level1 lfo6">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b><span style="font-family:"Times New Roman",serif">Terrestrial Time (TT)</span></b><span style="font-family:"Times New Roman",serif">, (or Terrestrial Dynamical Time,
<b>TDT</b>), with unit of duration 86400 SI seconds on the geoid, is the independent argument of apparent
<i>geocentric </i>ephemerides. TDT = TAI + 32.184 seconds. </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:2.0in;text-indent:-.25in;mso-list:l0 level1 lfo6">
<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b><span style="font-family:"Times New Roman",serif">Barycentric Dynamical Time (TDB)</span></b><span style="font-family:"Times New Roman",serif">, is the independent argument of ephemerides and dynamical theories that are referred
to the <i>solar system barycenter</i>. TDB varies from TT only by periodic variations.
</span><span style="font-size:11.0pt;color:#1F497D"><br>
<br>
<br>
</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l2 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:11.0pt;color:#1F497D">Regarding Time Transfer: this might be very dependent on the location of time data source and –data sinks (Ground-Ground or S/C<->Ground, etc.); European spacecraft follow very often the
PUS standard (<a href="https://ecss.nl/standard/ecss-e-st-70-41c-space-engineering-telemetry-and-telecommand-packet-utilization-15-april-2016/">https://ecss.nl/standard/ecss-e-st-70-41c-space-engineering-telemetry-and-telecommand-packet-utilization-15-april-2016/</a>)
“Time management service”. </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:#1F497D">Best regards, Christian</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">Von:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> SEA-TIME [mailto:sea-time-bounces@mailman.ccsds.org]
<b>Im Auftrag von </b>Shames, Peter M (312B) via SE</span><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma",sans-serif">A-TIME<br>
<b>Gesendet:</b> Dienstag, 22. Januar 2019 21:05<br>
<b>An:</b> Shames, Peter M (312B) via SEA-TIME<br>
<b>Betreff:</b> [Sea-time] SEA-Time telecon minutes</span><o:p></o:p></p>
</div>
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<p class="MsoNormal" style="margin-left:.5in"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">Dear SEA Time BoF members,</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">I have uploaded the minutes of the meeting (thanks Erika) and the other submissions (revised definitions from the telecon and draft Charter) to the CCSDS CWE site. They are all in
the Meeting Materials for 2019 folder:</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"><a href="https://cwe.ccsds.org/sea/docs/Forms/AllItems.aspx?RootFolder=%2Fsea%2Fdocs%2FSEA%2DTIME%2FMeeting%20Materials%2F2019&View=%7BA709F322%2D0E67%2D45C7%2D932D%2DCB78C55CE268%7D&">https://cwe.ccsds.org/sea/docs/Forms/AllItems.aspx?RootFolder=%2Fsea%2Fdocs%2FSEA%2DTIME%2FMeeting%20Materials%2F2019&View=%7BA709F322%2D0E67%2D45C7%2D932D%2DCB78C55CE268%7D&</a></span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">If you do not have read/write access to this please contact the CCSDS Secretariat and request it (CCSDS Secretariat
<a href="mailto:secretariat@mailman.ccsds.org">secretariat@mailman.ccsds.org</a>). As a working member of the BoF you should be granted access to everything, but it may take approval of your agency representative (nominally the CMC member) for it to be granted.</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">You should all now have a calendar invite for the next Telecon, on 5 Feb 2019 @ 0700 Pacfific (with the standard offsets for those distant from the Left Coast Barycenter).</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">Cheers, Peter</span><o:p></o:p></p>
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