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A fresh new crater in the center of an older crater basin provides a landmark for the tiny crater named Hun kal- the Mayan number 20 - which is the basis for positioning the longitudes on
Mercury. By definition, the 20° meridian passes through the center of this small crater. Assuming that the spin
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axis of
Mercury is perpendicular to its orbital plane, the latitude of Hun Kal is 0.23°S. This picture, which covers an area of 130 by 170 km ( 90 by 105 mi), was taken from a distance of about 20,700 km (12,860 mi), a half-hour before Mariner made its first close flyby of Mercury, March 1974.
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717:{{Information |Description={{en|A fresh new crater in the center of an older crater basin provides a landmark for the tiny crater named Hun kal- the Mayan number 20 - which is the basis for positioning the longitudes on Mercury. By definition, the 20° me
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joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use.
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states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."
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