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<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Times New Roman","serif"">(NOTE: Follow-up Reminder with no content change.)<span></span></span></p>
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<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><b><span style="font-size:14pt;font-family:"Times New Roman","serif"">May 5,
2021<span></span></span></b></p>
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<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><b><span style="font-size:14pt;font-family:"Times New Roman","serif"">Space
Debris: A Big Problem</span></b><span style="font-size:14pt;font-family:"Times New Roman","serif""> (Georg Kirchner) <br>
<i>When the first satellites were launched some 60 years ago, space was more
or less empty. However, the ever increasing launching activities since that
now have created a rather crowded environment above our heads: More than
30.000 space debris objects – old / defunct satellites, upper stages of
rockets, remaining parts after explosions of collisions etc. – are now
orbiting in different altitudes, tracked by radar, laser and passive optical
telescopes. The possibility of collisions is already rather high: Collision
warning systems create already more than 1000 warnings per day (!) of close
encounters between 2 objects – and sometimes this is TOO close – and a collision
between two space debris objects, at velocities of 27.000 km/h, creates
several 1000 new space debris parts… <br>
Satellite Laser Ranging (SLR) has demonstrated during the last years the
capability of tracking such debris objects, helping to determine their
accurate orbit, and also their tumbling motions – important features if you
want to catch an old upper stage, and remove it from space. <br>
</i>Dr. Georg Kirchner is a group leader at the Space Research Institute,
Department of Satellite Geodesy, Austrian Academy of Sciences in Graz,
Austria.<b><span></span></b></span></p>
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<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Times New Roman","serif""><span> </span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><b><i><span style="font-size:12pt;font-family:"Times New Roman","serif";color:black">SPECIAL NOTE - </span></i></b><i><span style="font-size:12pt;font-family:"Times New Roman","serif";color:black">Links to many of our previous sessions are
available online at <a href="http://lctg.toku.us/" style="color:blue;text-decoration:underline" target="_blank"><span style="color:blue">http://lctg.toku.us/</span></a>, thanks to the diligence of
Steve Isenberg. This includes the space-oriented presentations of Mars Landing
from February 24, Venus Temperature from March 17, and Apollo Mission from
April 14.<span></span></span></i></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:13.5pt;font-family:"Times New Roman","serif";color:black"><span> </span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Times New Roman","serif";color:black">We, the Lexington
Computer and Technology Group, will meet Wednesday at the usual 10AM Eastern Time,
BUT ONLINE, using the Zoom Video Conferencing Application, facilitated by Steve
Isenberg. </span><span style="font-size:12pt;font-family:"Times New Roman","serif""><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Times New Roman","serif";color:black">There is an instruction
page at <a href="https://toku.us/zoomish" style="color:blue;text-decoration:underline" target="_blank"><span style="color:blue">https://toku.us/zoomish</span></a> but note that the URL and
phone number shown are examples.</span><span style="font-size:12pt;font-family:"Times New Roman","serif""><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Times New Roman","serif""><span> </span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Times New Roman","serif";color:black">Sometime after 9:45AM on
Wednesday, choose one of the following options:</span><span style="font-size:12pt;font-family:"Times New Roman","serif""><span></span></span></p>
<ul style="margin-bottom:0in" type="disc"><li class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Times New Roman","serif";color:black">If you have the Zoom application installed, start it and join
meeting with ID 972 6146 0830</span><span style="font-size:12pt;font-family:"Times New Roman","serif""><span></span></span></li><li class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Times New Roman","serif";color:black">From your browser, go to: <a href="https://zoom.us/j/97261460830" style="color:blue;text-decoration:underline" target="_blank"><span style="color:blue">https://zoom.us/j/97261460830</span></a></span><span style="font-size:12pt;font-family:"Times New Roman","serif""><span></span></span></li><li class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Times New Roman","serif";color:black">From your smartphone, tap this: +16468769923,,97261460830</span><span style="font-size:12pt;font-family:"Times New Roman","serif""><span></span></span></li><li class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Times New Roman","serif";color:black">From a “dumb” telephone, call 1 646 876 9923 and enter
meeting ID: 972 6146 0830 </span><span style="font-size:12pt;font-family:"Times New Roman","serif""><span></span></span></li></ul>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Times New Roman","serif";color:black">Once the connection is
established, you may need to locate and use the on-screen controls that turn on
the sound and the video. You should be able to see and hear others and they should
be able to see and hear you, if you have a camera and microphone (each of which
you can unmute selectively).</span><span style="font-size:12pt;font-family:"Times New Roman","serif""><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Trebuchet MS","sans-serif";color:rgb(11,83,148)">If this email wasn't addressed to you and you
would like to join the group, or if you have a friend or colleague who might
also be interested in joining, it's easy. Ask them to go to the group's
wiki page at </span><span style="font-size:12pt;font-family:"Times New Roman","serif""><a href="http://LCTG.toku.us" style="color:blue;text-decoration:underline" target="_blank"><span style="font-family:"Courier New";color:blue">http://LCTG.toku.us</span></a></span><span style="font-size:12pt;font-family:"Courier New";color:rgb(11,83,148)"> </span><span style="font-size:12pt;font-family:"Trebuchet MS","sans-serif";color:rgb(11,83,148)">and follow the simple
instructions under "Join the Email List". By being a member of
the group you'll get reminders of upcoming meetings and infrequent related
messages. No advertising. The list is tightly managed.<span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><span style="font-size:12pt;font-family:"Trebuchet MS","sans-serif";color:rgb(11,83,148)">Membership is free and given that all meetings
are using Zoom you only need to be connected to the Internet to join.
It's ok to join from anywhere you can get a decent Internet connection, even if
you're in orbit around Earth or on another planet or a moon (if you're
connecting from somewhere not on Earth, we'd like to chat).</span><span style="font-size:12pt;font-family:"Times New Roman","serif""><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><b><i><span style="font-size:16pt;font-family:"Times New Roman","serif";color:black">Below are our plans for Upcoming Meetings. For
more schedule information, please refer to <a href="https://wiki.toku.us/doku.php?id=lctg_speaker_schedule" style="color:blue;text-decoration:underline" target="_blank"><span style="color:blue">https://wiki.toku.us/doku.php?id=lctg_speaker_schedule</span></a>
We will continue to have an online presentation (almost) every Wednesday until
it is prudent for us to resume meeting in person.<span></span></span></i></b></p>
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<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><b><span style="font-size:14pt;font-family:"Times New Roman","serif"">May 12,
2021<span></span></span></b></p>
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<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><b><span style="font-size:14pt;font-family:"Times New Roman","serif"">What
Was It Like: I Lived In Antarctica</span></b><i><span style="font-size:14pt;font-family:"Times New Roman","serif""> Ivor Morgan lived in Antarctica from late 1961 to
early 1964 and worked for the British Antarctic Survey (BAS) as a surveyor in
topographic and hydrographic mapping of the Antarctic Peninsula. His most
recent trip south was 5 years ago. The Antarctic Peninsula is still the
primary focus of BAS bases. A major secondary area was the Base at Halley Bay
on the south of the Weddell Sea—and today almost in it. Ivor will explain
more during his talk. He'll also go over maps of Antarctica to help you
become familiar with this interesting and unique continent.</span></i><b><span style="font-size:14pt;font-family:"Times New Roman","serif""><span></span></span></b></p>
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<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><b><span style="font-size:14pt;font-family:"Times New Roman","serif"">May 19,
2021<span></span></span></b></p>
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<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Calibri","sans-serif""><b><span style="font-size:14pt;font-family:"Times New Roman","serif"">Potpourri
<br>
</span></b><i><span style="font-size:14pt;font-family:"Times New Roman","serif"">>
Rober and Jello <a href="https://www.youtube.com/watch?v=DPZzrlFCD_I" title="https://www.youtube.com/watch?v=DPZzrlFCD_I" style="color:blue;text-decoration:underline" target="_blank"><span style="color:windowtext;text-decoration:none">link</span></a> <br>
> 3-year effort to video two vortex rings colliding in super slow motion. <a href="https://youtu.be/EVbdbVhzcM4" title="https://youtu.be/EVbdbVhzcM4" style="color:blue;text-decoration:underline" target="_blank"><span style="color:windowtext;text-decoration:none">link; 8min</span></a>
<br>
> Synchronization <a href="https://youtu.be/t-_VPRCtiUg" title="https://youtu.be/t-_VPRCtiUg" style="color:blue;text-decoration:underline" target="_blank"><span style="color:windowtext;text-decoration:none">link; 20min</span></a> <br>
> and more (maybe, you have suggestions?)</span></i><span style="font-size:14pt;font-family:"Times New Roman","serif""><span></span></span></p>
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