Mare Crisium
                            Earth-based telescopic image                    Cropped Lunar Orbiter image
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Image by AstroImaging (Zerbe)
 crisiumc2.jpg
Full sized  version of Lunar Orbiter
 LO4-191H3
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Brief
Mare Crisium, or the "Sea of Crisis", is always an awesome sight. It covers four Lunar sections: 26,27,37,38 . Resembling a giant crater, this feature is 570 km across and is a lunar basin of impact origin. Long ago the floor was submerged under thick layers of lava. Its oval appearance to us is somewhat caused by its location close to the eastern limb, but its actual shape IS ellipsoid in the horizontal direstion. The overhead Lunar Orbiter view shows more detail. We "corrected" the image of Crisium from LO4 to show the actual shape. 
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Other Lunar Orbiter images
 http://www.lpi.usra.edu/research/lunar_orbiter/img/4-177H1.jpg
 http://www.lpi.usra.edu/research/lunar_ orbiter/img/4-62H1.jpg
 http://www.lpi.usra.edu/research/lunar_ orbiter/img/4-61H2.jpg
 http://www.lpi.usra.edu/research/lunar_ orbiter/img/4-54H3.jpg
 http://www.lpi.usra.edu/research/lunar_orbiter/img/4-178H1.jpg
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For the latest information and images regarding this section, including Apollo Hasselblad (H), Metric (M), and Panoramic (P) images, go to:
Sections 26,27,37,38 
 Clickable Sections Map
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This web page was created by Francis Ridge for The Lunascan Project:
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