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| − | =Daggers And Inverse Daggers= | + | == |
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| − | <!-- ws:start:WikiTextLocalImageRule:6:<img src="/file/view/LPOD-Jan2-10.jpg/190449918/LPOD-Jan2-10.jpg" alt="" title="" /> -->[[File:LPOD-Jan2-10.jpg|LPOD-Jan2-10.jpg]]<!-- ws:end:WikiTextLocalImageRule:6 --><br />
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| − | <em>image by [mailto:jocelyn.serot@wanadoo.fr Jocelyn Sérot], France</em><br />
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| − | The Moon's surface is simply ups and downs, with the juxtaposition between each creating topography. The variation in the elevation and azimuth of illumination yields a constantly changing pattern of shadows. Here Jocelyn has caught daggers of light and shadow that tell us about local ups and downs. A broad blade of shadow cuts across the floor of Walther (bottom center), being projected by its pit-topped central peak. [http://www.lpi.usra.edu/resources/lunar_orbiter/images/img/iv_107_h3.jpg Except] the peak isn't centered in the crater, and the summit pit is less real than it looks (but the smaller pit lower down the peak is real). A negative dagger - a widening blade of light - illuminates a swath of the southern floor of Purbach (upper left). Topography is deceiving, for there is little indication that Purbach has a low spot in its southeastern rim, but the magnification of a long shadow reveals there must be. Look back down at the western rim of Walther to see a blunter dagger of light. In this case a broad section of the rim is low so that the there isn't a V-shaped illuminated area, but one that looks like a slice of pie that someone - not me - has eaten the tip of.<br />
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| − | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br />
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| − | <br />
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| − | <strong>Technical Details</strong><br />
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| − | Dec 13, 2010, 19h36 UT. 6" MCT @ F/D=24 (Barlow), Red filter, DMK 31 camera; Processing: Avistack 2 + Registax 5<br />
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| − | <br />
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| − | <strong>Related Links</strong><br />
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| − | Rükl plate [http://the-moon.wikispaces.com/R%C3%BCkl+65 65]<br />
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| − | <br />
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| − | <p><b>Yesterday's LPOD:</b> [[January 1, 2011|New Year's Moon]] </p>
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| − | <p><b>Tomorrow's LPOD:</b> [[January 3, 2011|Touch the Moon]] </p>
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| − | <hr />
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Revision as of 14:20, 1 March 2015
