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<p>Upon further reflection of <u><i><b>all</b></i></u> factors
affecting L2, the following points should also be considered, and
my "piece of cake" comment in my earlier note should be ignored
(invalid):</p>
<p>1) The Earth's Umbra extends about 0.87-million miles. At the
0.93-million mi distance of L2, the Web Telescope (Web) will never
be totally in the dark Umbra. So, as Larry pointed out, the Web
will always see a sliver of the sun. However, the size of the
sliver will vary due to the following.<br>
</p>
<p>2) Most of the citations in the web refer to L2 as a "point". It
is a point in the cosmic sense but a rather "large region" because
of the following reasons:</p>
<ul>
<li>The Earth's orbit around the sun is elliptical, not circular.
Therefore, the L2-location fluctuates annually along the
"radial" direction (Sun-Earth line)<br>
</li>
<li>The L2 location is defined in the context of a 3-body system
(Sun-Earth-Web). However, the moon (4th body) causes L2 to
fluctuate monthly both "radially" and "perpendicularly" with
respect to the Sun-Earth line</li>
<li>Thus, the "perturbed L2" (at gravitational equilibrium with
respect to Sun-Earth-Moon) will move annually within an ovoid
volume around the ideal 3-body L2</li>
<li>Therefore, the Web Telescope will experience a variable
exposure to Solar radiation annually <br>
</li>
</ul>
<p>Tony<br>
</p>
================<br>
<div class="moz-cite-prefix">On 12/28/21 8:42 PM, Tony wrote:<br>
</div>
<blockquote type="cite"
cite="mid:2c2eb7e2-d667-bd19-073b-9d29fd8284bf@verizon.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Supplement to address Carl's question: <br>
</p>
<p>Remember that the earth totally eclipses the moon (when
suitably aligned), which is about 1/4 million miles away and has
a ~2000-mi diameter (3,468 KM). So, at 1 million miles distance
(4 times the Earth-Moon distance) the earth could eclipse an
object that has a 500 miles diameter. SO, the telescope will
truly be a piece of cake in that shadow.</p>
<p>Tony</p>
<p>=======<br>
</p>
<div class="moz-cite-prefix">On 12/28/21 6:16 PM, George Gamota
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:035f01d7fc40$e9e0cf90$bda26eb0$@stma-llc.com">
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:18.0pt;color:#1F497D">The location of the
Webb is such that only some square feet need to be
blocking the sun. Some geometry here helps.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:18.0pt;color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Carl Lazarus <a
class="moz-txt-link-rfc2396E"
href="mailto:carllazarus@comcast.net"
moz-do-not-send="true"><carllazarus@comcast.net></a>
<br>
<b>Sent:</b> Tuesday, December 28, 2021 5:14 PM<br>
<b>To:</b> 'George Gamota' <a
class="moz-txt-link-rfc2396E"
href="mailto:ggamota@stma-llc.com"
moz-do-not-send="true"><ggamota@stma-llc.com></a>;
'Stephen Quatrano' <a class="moz-txt-link-rfc2396E"
href="mailto:stefanoq@gmail.com"
moz-do-not-send="true"><stefanoq@gmail.com></a>;
<a class="moz-txt-link-abbreviated
moz-txt-link-freetext"
href="mailto:jjrudy1@comcast.net"
moz-do-not-send="true">jjrudy1@comcast.net</a><br>
<b>Cc:</b> 'Lex Computer Group' <a
class="moz-txt-link-rfc2396E"
href="mailto:lctg@lists.toku.us"
moz-do-not-send="true"><lctg@lists.toku.us></a><br>
<b>Subject:</b> RE: [Lex Computer & Tech Group/LCTG]
where is Webb<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is Earth’s shadow large enough to
completely block the sun from the James Webb telescope? I
thought the telescope has an elaborate sun shield.<o:p></o:p></p>
<p class="MsoNormal">-- Carl<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> LCTG <<a
href="mailto:lctg-bounces+carllazarus=comcast.net@lists.toku.us"
moz-do-not-send="true" class="moz-txt-link-freetext">lctg-bounces+carllazarus=comcast.net@lists.toku.us</a>>
<b>On Behalf Of </b>George Gamota<br>
<b>Sent:</b> Tuesday, December 28, 2021 3:41 PM<br>
<b>To:</b> 'Stephen Quatrano' <<a
href="mailto:stefanoq@gmail.com"
moz-do-not-send="true" class="moz-txt-link-freetext">stefanoq@gmail.com</a>>;
<a href="mailto:jjrudy1@comcast.net"
moz-do-not-send="true" class="moz-txt-link-freetext">jjrudy1@comcast.net</a><br>
<b>Cc:</b> 'Lex Computer Group' <<a
href="mailto:lctg@lists.toku.us"
moz-do-not-send="true" class="moz-txt-link-freetext">lctg@lists.toku.us</a>><br>
<b>Subject:</b> Re: [Lex Computer & Tech Group/LCTG]
where is Webb<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:18.0pt;color:#1F497D">Basically the Webb
would be fried (electronics burned) if it ever sees the
sun. So L2 places it in such a way that the Earth blocks
the sun (an eclipse) all the time. Thus the Webb goes
around the sun with Earth. Webb’s orbit then is one year
just as the Earth.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:18.0pt;color:#1F497D">George.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:18.0pt;color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> LCTG <<a
href="mailto:lctg-bounces+ggamota=stma-llc.com@lists.toku.us"
moz-do-not-send="true" class="moz-txt-link-freetext">lctg-bounces+ggamota=stma-llc.com@lists.toku.us</a>>
<b>On Behalf Of </b>Stephen Quatrano<br>
<b>Sent:</b> Tuesday, December 28, 2021 1:08 PM<br>
<b>To:</b> <a href="mailto:jjrudy1@comcast.net"
moz-do-not-send="true" class="moz-txt-link-freetext">jjrudy1@comcast.net</a><br>
<b>Cc:</b> Lex Computer Group <<a
href="mailto:lctg@lists.toku.us"
moz-do-not-send="true" class="moz-txt-link-freetext">lctg@lists.toku.us</a>><br>
<b>Subject:</b> Re: [Lex Computer & Tech Group/LCTG]
where is Webb<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Great graphics, John. I didn’t
understand L2 orbit so I Googled it:<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">"The space telescope is destined to
orbit a point in space known as Earth-sun Lagrange point 2
or L2, which is located nearly 1 million miles (1.5
million kilometers) away from Earth on the opposite side
as the sun. The spacecraft covered the first 10% of that
journey within 12 hours of launching.” <a
href="https://www.space.com/james-webb-space-telescope-trajectory-burn"
moz-do-not-send="true" class="moz-txt-link-freetext">https://www.space.com/james-webb-space-telescope-trajectory-burn</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">"The James Webb Space Telescope will
not orbit the Earth like Hubble but will in fact orbit the
Sun. It will travel for approximately 30 days before
reaching what is known as the second Lagrange point, or
L2, 1 million miles away.” <a
href="https://deepfieldfilm.com/discover/james-webbs-halo-orbit"
moz-do-not-send="true" class="moz-txt-link-freetext">https://deepfieldfilm.com/discover/james-webbs-halo-orbit</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Looking at the second animation, I’m
still not sure I understand it… but I keep trying.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Regards,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<div>
<div>
<div>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black">Stephen
Quatrano<br>
CEO and Cofounder | Meema, Inc<br>
web: <a href="http://meemastories.com"
moz-do-not-send="true"
class="moz-txt-link-freetext">http://meemastories.com</a><br>
<a href="mailto:stephen.quatrano@meemastories.com"
moz-do-not-send="true">email: stephen.quatrano@meemastories.com</a><br>
cell: +1 781-266-8799<br>
<a href="https://www.linkedin.com/in/quatrano/"
moz-do-not-send="true"
class="moz-txt-link-freetext">https://www.linkedin.com/in/quatrano/</a><br>
<br>
Board Member | The Right Question Institute<br>
<a href="http://www.rightquestion.org"
moz-do-not-send="true"
class="moz-txt-link-freetext">http://www.rightquestion.org</a><br>
<br>
Lifelong Learner<br>
<a href="http://www.howdoweknow.info/p/home.html"
moz-do-not-send="true"
class="moz-txt-link-freetext">http://www.howdoweknow.info/p/home.html</a><br>
<a href="http://stefano.quatrano.us/"
moz-do-not-send="true"
class="moz-txt-link-freetext">http://stefano.quatrano.us/</a><o:p></o:p></span></p>
</div>
</div>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">On Dec 28, 2021, at 12:35 PM,
<<a href="mailto:jjrudy1@comcast.net"
moz-do-not-send="true"
class="moz-txt-link-freetext">jjrudy1@comcast.net</a>>
<<a href="mailto:jjrudy1@comcast.net"
moz-do-not-send="true"
class="moz-txt-link-freetext">jjrudy1@comcast.net</a>>
wrote:<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial",sans-serif">This
is a nice NASA site that shows its location in
realtime<span class="apple-converted-space"> </span><a
href="https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html"
moz-do-not-send="true"><span
style="color:#0563C1">https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html</span></a></span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif">John
Rudy</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif"> </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif">781-861-0402</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif">781-718-8334
cell</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif">13
Hawthorne Lane</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif">Bedford
MA</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif"><a
href="mailto:jjrudy1@comcast.net"
moz-do-not-send="true"><span
style="color:#0563C1">jjrudy1@comcast.net</span></a></span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><image001.png><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Helvetica",sans-serif">===============================================<br>
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<pre class="moz-quote-pre" wrap="">===============================================
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