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English: Original figure caption:
Figure 1. Four Apollo Metric frames of the same area in Mare Imbrium each taken under different solar illumination conditions (AS15-M-2170, AS15-M-1145, AS15-M-0596, and AS15-M-0423).
In Figure 1 we see the same region on the lunar surface under progressively different illumination conditions (this region was previously discussed in March 25 Apollo Featured Image). This week, you can see a series of four images that illustrate this important concept much more fully.
Each picture was taken on a different orbit as the relative positions of the Sun, the Moon, and the Apollo 15 Command Module Endeavour, as the relative positions of the Sun, the Moon, and the Endeavour progressed (upper left: solar incidence angle 48 degrees upper right: 73 degrees, lower left: 83 degrees, and lower right 88 degrees. In the upper left, Mare Imbrium appears flat and inviting; the image of the same area in the lower right looks rather forbidding.
The reality is that there are many safe landing places in Figure 1. This is why it is so important to re-image potential landing sites at various illumination angles to accurately portray the roughness and slope of a particular landing site. Data from both the upcoming Lunar Reconnaissance Orbiter Camera and the Lunar Orbital Laser Altimeter, which are both instruments aboard the Lunar Reconnaissance Orbiter, will be used by NASA to fully assess the roughness and topography of potential landing sites on the the lunar surface as we prepare for the seventh human lunar landing and beyond.
Date
Source https://apollo.sese.asu.edu/LIW/20080805.html
Author NASA/JSC/Arizona State University
This image or video was catalogued by one of the centers of the United States National Aeronautics and Space Administration (NASA) under Photo ID: AS15-M-2170.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.
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Licensing

Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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Frames of the same area in Mare Imbrium each taken under different solar illumination

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8 May 2008

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