Difference between revisions of "January 29, 2004"

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=Nodding Moon=
 
=Nodding Moon=
 
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      <td width="50%"><h2 align="left">Nodding Moon</h2></td>
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      <td width="50%"><h2 align="right">January 29, 2004</h2></td>
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[[File:LPOD-2004-01-29.jpeg|LPOD-2004-01-29.jpeg]]</div></td>
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      <td><div align="center" span class="main_sm">Image Credit:  <A class="one" HREF="mailto:dave.a.haworth@exgate.tek.com">David Haworth</A></div></td>
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<td><div align="center" span class="main_sm">Image Credit:  [mailto:dave.a.haworth@exgate.tek.com David Haworth]</div></td>
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  <p class="story" align="center"><b>Nodding Moon</b></p>
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<p class="story" align="center"><b>Nodding Moon</b></p>
  <p class="story" align="left">We glance up and notice the Moon, seeing that its phase and place in the sky are different from yesterday, and we  
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<p class="story" align="left">We glance up and notice the Moon, seeing that its phase and place in the sky are different from yesterday, and we  
 
congratulate ourself for our visual astuteness and for being in tune with the cosmos. But is that the only way the Moon  
 
congratulate ourself for our visual astuteness and for being in tune with the cosmos. But is that the only way the Moon  
 
changes? This lunar pair by David Haworth graphically illustrates that the answer is No! The Moon librates, or nods to  
 
changes? This lunar pair by David Haworth graphically illustrates that the answer is No! The Moon librates, or nods to  
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but make sure the side tilted Earthward is actually visible. Perversely, sometimes the best librations occur when the  
 
but make sure the side tilted Earthward is actually visible. Perversely, sometimes the best librations occur when the  
 
limb area of interest is in shadow!  
 
limb area of interest is in shadow!  
 
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<p><b>Technical Details:</b><br>
  <p><b>Technical Details:</b><br>
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Both images taken with Orion Argonaut 150mm, f/12 Maksutov-Cassegrain telescope and a Nikon Coolpix 990  
    Both images taken with Orion Argonaut 150mm, f/12 Maksutov-Cassegrain telescope and a Nikon Coolpix 990  
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digital camera, afocal coupled with a ScopeTronix STWA18 Wide Angle 18mm eyepiece/adapter. For more  
            digital camera, afocal coupled with a ScopeTronix STWA18 Wide Angle 18mm eyepiece/adapter. For more  
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information see David's Libration's [http://www.stargazing.net/david/moon/moonlibration.html web  
            information see David's Libration's [http://www.stargazing.net/david/moon/moonlibration.html web  
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page] and [http://www.stargazing.net/david/moon/day06h9moonhalftext.html image page]. </p>
            page] and [http://www.stargazing.net/david/moon/day06h9moonhalftext.html image page]. </p>
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<p class"story"><b>Related Links:</b><br>
  <p class"story"><b>Related Links:</b><br>
 
 
[http://www.phy6.org/stargaze/Smoon4.htm Librations of the Moon]<br>
 
[http://www.phy6.org/stargaze/Smoon4.htm Librations of the Moon]<br>
 
[http://www2.globetrotter.net/faaq/ephemerides/librations.htm Graphical librations] (scroll down)</p>
 
[http://www2.globetrotter.net/faaq/ephemerides/librations.htm Graphical librations] (scroll down)</p>
  <p class"story"> <b>Tomorrow's LPOD:</b> Lake of Death</p>
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<p class"story"> <b>Tomorrow's LPOD:</b> Lake of Death</p>
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      <td><p align="center" class="main_titles"><b>Author & Editor:</b><br>
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<td><p align="center" class="main_titles"><b>Author & Editor:</b><br>
          [mailto:chuck@observingthesky.org Charles A. Wood]</p>
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[mailto:chuck@observingthesky.org Charles A. Wood]</p>
        <p align="center" class="main_titles"><b>Technical Consultant:</b><br>
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<p align="center" class="main_titles"><b>Technical Consultant:</b><br>
            [mailto:anthony@perseus.gr Anthony Ayiomamitis]</p>
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[mailto:anthony@perseus.gr Anthony Ayiomamitis]</p>
        <p align="center" class="main_titles"><b>[mailto:webmaster@entropysponge.com Contact Webmaster]</b></p>
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<p align="center" class="main_titles"><b>[mailto:webmaster@entropysponge.com Contact Webmaster]</b></p>
        <p align="center" class="main_titles"><b>A service of:</b><br>
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<p align="center" class="main_titles"><b>A service of:</b><br>
            <a class="one" href="http://www.observingthesky.org/">ObservingTheSky.Org</a></p>
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[http://www.observingthesky.org/ ObservingTheSky.Org]</p>
        <p align="center" class="main_titles"><b>Visit these other PODs:</b> <br>
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<p align="center" class="main_titles"><b>Visit these other PODs:</b> <br>
          <a class="one" href="http://antwrp.gsfc.nasa.gov/apod/astropix.html">Astronomy</a> | <a class="one" href="http://www.msss.com/">Mars</a> | <a class="one" href="http://epod.usra.edu/">Earth</a></p></td>
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[http://antwrp.gsfc.nasa.gov/apod/astropix.html Astronomy] | [http://www.msss.com/ Mars] | [http://epod.usra.edu/ Earth]</p></td>
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Revision as of 17:08, 4 January 2015

Nodding Moon

LPOD-2004-01-29.jpeg
Image Credit: David Haworth

Nodding Moon

We glance up and notice the Moon, seeing that its phase and place in the sky are different from yesterday, and we congratulate ourself for our visual astuteness and for being in tune with the cosmos. But is that the only way the Moon changes? This lunar pair by David Haworth graphically illustrates that the answer is No! The Moon librates, or nods to the left or right, up or down, so we actually can glimpse 59% of its surface area. Today's LPOD shows libration in longitude, which occurs because the Moon's rotation about its polar axis is constant, but its elliptical orbit causes it to speed up and slow down at different times so the rotation lags or leads the orbital motion. This pair shows how Crisium is more foreshortened and bunched up close to the limb when libration in longitude is poor (5 July 2003; libration in longitude, l, is -4.5 degrees), but is more circular when libration is quite good (29 Dec 2003; l = +7.0 degrees). Notice that some limb maria such as Humboldtianum, Marginis and Smythii may even be invisible when librations are not favorable. If you want to map the extreme [LPOD-2004-01-25.htm limb regions] check the librations, but make sure the side tilted Earthward is actually visible. Perversely, sometimes the best librations occur when the limb area of interest is in shadow!

Technical Details:
Both images taken with Orion Argonaut 150mm, f/12 Maksutov-Cassegrain telescope and a Nikon Coolpix 990 digital camera, afocal coupled with a ScopeTronix STWA18 Wide Angle 18mm eyepiece/adapter. For more information see David's Libration's [http://www.stargazing.net/david/moon/moonlibration.html web page] and image page.

Related Links:
Librations of the Moon
Graphical librations (scroll down)

Tomorrow's LPOD: Lake of Death

<img src="../../../MainPage/spacer.gif" width="640" height="1">


Author & Editor:
Charles A. Wood

Technical Consultant:
Anthony Ayiomamitis

Contact Webmaster

A service of:
ObservingTheSky.Org

Visit these other PODs:
Astronomy | Mars | Earth

 


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