File:Hun Kal crater on Mercury.jpg

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English: 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 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.
Source http://history.nasa.gov/SP-424/p112.htm
Author Mariner 10
Other versions cropped to show Hun Kal more plainly

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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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current21:06, 9 April 2008Thumbnail for version as of 21:06, 9 April 20081,294 × 1,102 (310 KB)Bryan Derksen (talk | contribs){{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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