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| − | =Copernicus On the Limb= | + | =Copernicus on the Limb= |
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| + | <p>[[File:Pythagoras_2007.10.05-lpod.jpg|pythagoras_2007.10.05-lpod.jpg]]<br /> |
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| − | <p>[[File:Pythagoras_2007.10.05-lpod.jpg|pythagoras_2007.10.05-lpod.jpg]]<br /> | |
| | <em>image by [mailto:rhineland@hotmail.com Oliver Pettenpaul]</em></p> | | <em>image by [mailto:rhineland@hotmail.com Oliver Pettenpaul]</em></p> |
| − | <p>Oliver likes limb views and so do I. This oblique perspective of [http://the-moon.wikispaces.com/Pythagoras Pythagoras] is unusual, for the 130 km wide crater is 27° in longitude from the mean limb and not usually seen so much on edge. We can see the central peak in profile - its a relatively steep-sided triangular mountain - fitting for Pythagoras! The brightness of one peak is probably due to it being at the right angle to effectively reflect sunlight, but perhaps is also partially because it contains anorthosite, the aluminum-rich, whitish rock of the lunar highlands. The floor of the crater looks quite flat, like the foreground Mare Frigoris. The little crater near the bottom of the opposite rim is on the northwest side of the crater, so we are looking approximately north of west. The shadow-casting scarp along the rim crest on the left side of the crater appears quite steep. I didn’t realize how flat the rim is below the scarp, and how it almost rolls over toward the floor. Near the middle of the image is Robinson - a crater with such a smooth rim that looks like it was turned on a lathe. And near the foreground is Horrebrow and its A, locked in an incestuous embrace. Oliver’s image illustrates that there is no bad time to look at the Moon, for even a very bad libration leads to a new view of old friends. </p> | + | <p>Oliver likes limb views and so do I. This oblique perspective of [https://the-moon.us/wiki/Pythagoras Pythagoras] is unusual, for the 130 km wide crater is 27° in longitude from the mean limb and not usually seen so much on edge. We can see the central peak in profile - its a relatively steep-sided triangular mountain - fitting for Pythagoras! The brightness of one peak is probably due to it being at the right angle to effectively reflect sunlight, but perhaps is also partially because it contains anorthosite, the aluminum-rich, whitish rock of the lunar highlands. The floor of the crater looks quite flat, like the foreground Mare Frigoris. The little crater near the bottom of the opposite rim is on the northwest side of the crater, so we are looking approximately north of west. The shadow-casting scarp along the rim crest on the left side of the crater appears quite steep. I didn’t realize how flat the rim is below the scarp, and how it almost rolls over toward the floor. Near the middle of the image is Robinson - a crater with such a smooth rim that looks like it was turned on a lathe. And near the foreground is Horrebrow and its A, locked in an incestuous embrace. Oliver’s image illustrates that there is no bad time to look at the Moon, for even a very bad libration leads to a new view of old friends. </p> |
| | <p><em></em><em>Chuck Wood</em></p> | | <p><em></em><em>Chuck Wood</em></p> |
| | <p><em><strong>Technical Details:</strong><br /> | | <p><em><strong>Technical Details:</strong><br /> |
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| | Rükl plate 2<br /> | | Rükl plate 2<br /> |
| | [http://www.astro-imaging.de/astro/ Oliver’s website]</em></p> | | [http://www.astro-imaging.de/astro/ Oliver’s website]</em></p> |
| − | <p align="center"><em><br /> | + | <p><b>Yesterday's LPOD:</b> [[October 8, 2007|Slithering and Sliding]] </p> |
| − | </em><em>Now you can support LPOD when you buy ANY book from Amazon thru [http://www.lpod.org/?page_id=102 LPOD!]</em></p> | + | <p><b>Tomorrow's LPOD:</b> [[October 10, 2007|First View with a New Scope]] </p> |
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| − | ---- | + | <p> </p> |
| − | ===COMMENTS?===
| + | <!-- End of content --> |
| − | Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment.
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