<div dir="ltr">Per wikipedia about L2: <span style="color:rgb(32,33,34);font-family:sans-serif;font-size:19.25px">Sun–Earth L</span><sub style="line-height:1;font-size:15.4px;color:rgb(32,33,34);font-family:sans-serif">2</sub><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:19.25px"> is a good spot for space-based observatories. Because an object around L</span><sub style="line-height:1;font-size:15.4px;color:rgb(32,33,34);font-family:sans-serif">2</sub><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:19.25px"> will maintain the same relative position with respect to the Sun and Earth, shielding and calibration are much simpler. It is, however, slightly beyond the reach of Earth's </span><a href="https://en.wikipedia.org/wiki/Umbra,_penumbra_and_antumbra" title="Umbra, penumbra and antumbra" style="text-decoration-line:none;color:rgb(6,69,173);background-image:none;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;font-family:sans-serif;font-size:19.25px">umbra</a><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:19.25px">,</span><sup id="gmail-cite_ref-25" class="gmail-reference" style="line-height:1;unicode-bidi:isolate;white-space:nowrap;font-size:15.4px;color:rgb(32,33,34);font-family:sans-serif"><a href="https://en.wikipedia.org/wiki/Lagrange_point#cite_note-25" style="text-decoration-line:none;color:rgb(6,69,173);background:none">[24]</a></sup><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:19.25px"> so solar radiation is not completely blocked at L</span><sub style="line-height:1;font-size:15.4px;color:rgb(32,33,34);font-family:sans-serif">2</sub><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:19.25px">. </span><div><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:19.25px"><br></span></div><div><span style="color:rgb(32,33,34);font-family:sans-serif;font-size:19.25px">Webb will see a ring of the sun like a full eclipse. It needs some sun for the solar panels to work.</span></div><img src="cid:ii_kxqxzz3k0" alt="annular-solar-eclipse.jpg" width="562" height="562"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Dec 28, 2021 at 6:16 PM George Gamota <<a href="mailto:ggamota@stma-llc.com">ggamota@stma-llc.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="EN-US" style="overflow-wrap: break-word;"><div class="gmail-m_4141049625091588891WordSection1"><p class="MsoNormal"><span style="font-size:18pt;color:rgb(31,73,125)">The location of the Webb is such that only some square feet need to be blocking the sun. Some geometry here helps.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;color:rgb(31,73,125)"><u></u> <u></u></span></p><div><div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in"><p class="MsoNormal"><b>From:</b> Carl Lazarus <<a href="mailto:carllazarus@comcast.net" target="_blank">carllazarus@comcast.net</a>> <br><b>Sent:</b> Tuesday, December 28, 2021 5:14 PM<br><b>To:</b> 'George Gamota' <<a href="mailto:ggamota@stma-llc.com" target="_blank">ggamota@stma-llc.com</a>>; 'Stephen Quatrano' <<a href="mailto:stefanoq@gmail.com" target="_blank">stefanoq@gmail.com</a>>; <a href="mailto:jjrudy1@comcast.net" target="_blank">jjrudy1@comcast.net</a><br><b>Cc:</b> 'Lex Computer Group' <<a href="mailto:lctg@lists.toku.us" target="_blank">lctg@lists.toku.us</a>><br><b>Subject:</b> RE: [Lex Computer & Tech Group/LCTG] where is Webb<u></u><u></u></p></div></div><p class="MsoNormal"><u></u> <u></u></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.<u></u><u></u></p><p class="MsoNormal">-- Carl<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><div><div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in"><p class="MsoNormal"><b>From:</b> LCTG <<a href="mailto:lctg-bounces+carllazarus=comcast.net@lists.toku.us" target="_blank">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" target="_blank">stefanoq@gmail.com</a>>; <a href="mailto:jjrudy1@comcast.net" target="_blank">jjrudy1@comcast.net</a><br><b>Cc:</b> 'Lex Computer Group' <<a href="mailto:lctg@lists.toku.us" target="_blank">lctg@lists.toku.us</a>><br><b>Subject:</b> Re: [Lex Computer & Tech Group/LCTG] where is Webb<u></u><u></u></p></div></div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><span style="font-size:18pt;color:rgb(31,73,125)">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.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;color:rgb(31,73,125)">George.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;color:rgb(31,73,125)"><u></u> <u></u></span></p><div><div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in"><p class="MsoNormal"><b>From:</b> LCTG <<a href="mailto:lctg-bounces+ggamota=stma-llc.com@lists.toku.us" target="_blank">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" target="_blank">jjrudy1@comcast.net</a><br><b>Cc:</b> Lex Computer Group <<a href="mailto:lctg@lists.toku.us" target="_blank">lctg@lists.toku.us</a>><br><b>Subject:</b> Re: [Lex Computer & Tech Group/LCTG] where is Webb<u></u><u></u></p></div></div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Great graphics, John. I didn’t understand L2 orbit so I Googled it:<u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></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" target="_blank">https://www.space.com/james-webb-space-telescope-trajectory-burn</a><u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></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" target="_blank">https://deepfieldfilm.com/discover/james-webbs-halo-orbit</a><u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Looking at the second animation, I’m still not sure I understand it… but I keep trying.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Regards,<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><div><div><div><p class="MsoNormal"><span style="font-size:9pt;font-family:Helvetica,sans-serif;color:black">Stephen Quatrano<br>CEO and Cofounder | Meema, Inc<br>web: <a href="http://meemastories.com" target="_blank">http://meemastories.com</a><br><a href="mailto:stephen.quatrano@meemastories.com" target="_blank">email: stephen.quatrano@meemastories.com</a><br>cell: +1 781-266-8799<br><a href="https://www.linkedin.com/in/quatrano/" target="_blank">https://www.linkedin.com/in/quatrano/</a><br><br>Board Member | The Right Question Institute<br><a href="http://www.rightquestion.org" target="_blank">http://www.rightquestion.org</a><br><br>Lifelong Learner<br><a href="http://www.howdoweknow.info/p/home.html" target="_blank">http://www.howdoweknow.info/p/home.html</a><br><a href="http://stefano.quatrano.us/" target="_blank">http://stefano.quatrano.us/</a><u></u><u></u></span></p></div></div></div><div><p class="MsoNormal" style="margin-bottom:12pt"><u></u> <u></u></p><blockquote style="margin-top:5pt;margin-bottom:5pt"><div><p class="MsoNormal">On Dec 28, 2021, at 12:35 PM, <<a href="mailto:jjrudy1@comcast.net" target="_blank">jjrudy1@comcast.net</a>> <<a href="mailto:jjrudy1@comcast.net" target="_blank">jjrudy1@comcast.net</a>> wrote:<u></u><u></u></p></div><p class="MsoNormal"><u></u> <u></u></p><div><div><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,sans-serif">This is a nice NASA site that shows its location in realtime<span class="gmail-m_4141049625091588891apple-converted-space"> </span><a href="https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html" target="_blank"><span style="color:rgb(5,99,193)">https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html</span></a></span><u></u><u></u></p></div><div><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,sans-serif"> </span><u></u><u></u></p></div><div><p class="MsoNormal"><span style="font-size:10pt;font-family:Arial,sans-serif">John Rudy</span><u></u><u></u></p></div><div><p class="MsoNormal"><span style="font-size:10pt;font-family:Arial,sans-serif"> </span><u></u><u></u></p></div><div><p class="MsoNormal"><span style="font-size:10pt;font-family:Arial,sans-serif">781-861-0402</span><u></u><u></u></p></div><div><p class="MsoNormal"><span style="font-size:10pt;font-family:Arial,sans-serif">781-718-8334 cell</span><u></u><u></u></p></div><div><p class="MsoNormal"><span style="font-size:10pt;font-family:Arial,sans-serif">13 Hawthorne Lane</span><u></u><u></u></p></div><div><p class="MsoNormal"><span style="font-size:10pt;font-family:Arial,sans-serif">Bedford MA</span><u></u><u></u></p></div><div><p class="MsoNormal"><span style="font-size:10pt;font-family:Arial,sans-serif"><a href="mailto:jjrudy1@comcast.net" target="_blank"><span style="color:rgb(5,99,193)">jjrudy1@comcast.net</span></a></span><u></u><u></u></p></div><div><p class="MsoNormal"><image001.png><u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p></div><p class="MsoNormal"><span style="font-size:9pt;font-family:Helvetica,sans-serif">===============================================<br>::The Lexington Computer and Technology Group Mailing List::<br>Reply goes to sender only; 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