Difference between revisions of "July 9, 2007"

From LPOD
Jump to: navigation, search
(Created page with "__NOTOC__ =Straits of Fresnel= <div class="post" id="post-1237"> <div class="storycontent"> <p>caucasus20070424_lpod.jpg<br /> <em>...")
 
Line 1: Line 1:
 
__NOTOC__
 
__NOTOC__
 
=Straits of Fresnel=
 
=Straits of Fresnel=
 +
<div class="post" id="post-1237">
  
+
<div class="storycontent">
<div class="post" id="post-1237">
+
<p>[[File:Caucasus20070424_lpod.jpg|caucasus20070424_lpod.jpg]]<br />
 
<div class="storycontent">
 
<p>[[File:Caucasus20070424_lpod.jpg|caucasus20070424_lpod.jpg]]<br />
 
 
<em>image by [mailto:paolo@lazzarotti-optics.com  Paolo R. Lazzarotti], Massa, Italy.</em></p>
 
<em>image by [mailto:paolo@lazzarotti-optics.com  Paolo R. Lazzarotti], Massa, Italy.</em></p>
 
<p>Gilbralter is a small knob of mainland Europe that sticks out into the passage between the Mediterranean and the Atlantic, and yet the entire strait is named for it. Thus it seems reasonable that the gap in mountains that allows lavas from maria Imbrium and Serenitatis to meet be named the Straits of Fresnel, which is the leftmost headland of the Apennine Mountains (bottom right). The exact nature of the mountain gap that allows the existence of the strait is unknown, but Paolo&#8217;s magnificent image provides some clues for speculation. The northern end of the Apennines is relatively straight - as if the mountain&#8217;s northward continuation has been sheared off. The parallel linear mountains east of the strait midpoint - Caucasus Alpha (north range) and Fresnel Theta (south range) - seem to mark the sides of the gap.  Evidence for a discontinuity is provided by the truncation of the Fresnel Rilles to the south and the Theaetetus Rilles to the north of the strait. I guess that they are part of a previously continuous rille system whose middle has disappeared. Did a 60 km wide swath of mountains now occuppied by the strait sink? Is the Strait of Fresnel a wider version of the Alpine Valley? Is the giant gap in the Imbrium rim ring between the west end of the Carpathians and the Gruithuisen domes a larger version of these gaps?</p>
 
<p>Gilbralter is a small knob of mainland Europe that sticks out into the passage between the Mediterranean and the Atlantic, and yet the entire strait is named for it. Thus it seems reasonable that the gap in mountains that allows lavas from maria Imbrium and Serenitatis to meet be named the Straits of Fresnel, which is the leftmost headland of the Apennine Mountains (bottom right). The exact nature of the mountain gap that allows the existence of the strait is unknown, but Paolo&#8217;s magnificent image provides some clues for speculation. The northern end of the Apennines is relatively straight - as if the mountain&#8217;s northward continuation has been sheared off. The parallel linear mountains east of the strait midpoint - Caucasus Alpha (north range) and Fresnel Theta (south range) - seem to mark the sides of the gap.  Evidence for a discontinuity is provided by the truncation of the Fresnel Rilles to the south and the Theaetetus Rilles to the north of the strait. I guess that they are part of a previously continuous rille system whose middle has disappeared. Did a 60 km wide swath of mountains now occuppied by the strait sink? Is the Strait of Fresnel a wider version of the Alpine Valley? Is the giant gap in the Imbrium rim ring between the west end of the Carpathians and the Gruithuisen domes a larger version of these gaps?</p>
Line 17: Line 15:
 
The amazing [http://www.lazzarotti-optics.com/main.html telescope ]that creates these images</p>
 
The amazing [http://www.lazzarotti-optics.com/main.html telescope ]that creates these images</p>
 
<div align="center">Don’t forget to add yourself - as [http://www.frappr.com/?a=viewphoto&#038;id=3301085&#038;pid=5698142%22 Paolo] has done - to the growing list of lunatics at [http://www.lpod.org/?m=20070509 Frappr LPOD]!<em>You can support LPOD when you buy ANY book from Amazon thru [[LPOD]]</em></div>
 
<div align="center">Don’t forget to add yourself - as [http://www.frappr.com/?a=viewphoto&#038;id=3301085&#038;pid=5698142%22 Paolo] has done - to the growing list of lunatics at [http://www.lpod.org/?m=20070509 Frappr LPOD]!<em>You can support LPOD when you buy ANY book from Amazon thru [[LPOD]]</em></div>
</div>
+
</div>
 
 
 
 
----
 
----
 
===COMMENTS?===  
 
===COMMENTS?===  
 
Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment.
 
Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment.

Revision as of 18:55, 4 January 2015

Straits of Fresnel

caucasus20070424_lpod.jpg
image by Paolo R. Lazzarotti, Massa, Italy.

Gilbralter is a small knob of mainland Europe that sticks out into the passage between the Mediterranean and the Atlantic, and yet the entire strait is named for it. Thus it seems reasonable that the gap in mountains that allows lavas from maria Imbrium and Serenitatis to meet be named the Straits of Fresnel, which is the leftmost headland of the Apennine Mountains (bottom right). The exact nature of the mountain gap that allows the existence of the strait is unknown, but Paolo’s magnificent image provides some clues for speculation. The northern end of the Apennines is relatively straight - as if the mountain’s northward continuation has been sheared off. The parallel linear mountains east of the strait midpoint - Caucasus Alpha (north range) and Fresnel Theta (south range) - seem to mark the sides of the gap. Evidence for a discontinuity is provided by the truncation of the Fresnel Rilles to the south and the Theaetetus Rilles to the north of the strait. I guess that they are part of a previously continuous rille system whose middle has disappeared. Did a 60 km wide swath of mountains now occuppied by the strait sink? Is the Strait of Fresnel a wider version of the Alpine Valley? Is the giant gap in the Imbrium rim ring between the west end of the Carpathians and the Gruithuisen domes a larger version of these gaps?

Chuck Wood

Technical Details:
24 April 2007, 19:22-26UT. Gladius CF-315 Lazzarotti telescope (f/25), Lumenera Infinity 2-1M camera, Edmund Optics R filter, 140-170 frames stacked out of 2000.

Related Links:
Rükl plates 12, 13, 22, 23 (smack in the middle of a 4-corner intersection)
Paolo’s website
The amazing telescope that creates these images

Don’t forget to add yourself - as Paolo has done - to the growing list of lunatics at Frappr LPOD!You can support LPOD when you buy ANY book from Amazon thru LPOD

COMMENTS?

Click on this icon File:PostIcon.jpg at the upper right to post a comment.