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Hun Kal (crater) : ウィキペディア英語版 | Hun Kal (crater)
Hun Kal is a small crater on Mercury that serves as the reference point for the planet's system of longitude. The longitude of Hun Kal's center is defined as being 20° W, thus establishing the planet's prime meridian.〔(【引用サイトリンク】accessdate=22 October 2009 )〕 Hun Kal was chosen as a reference point since the actual prime meridian was in shadow when Mariner 10 photographed the region, hiding any features near 0° longitude from view. Hun Kal is about 1.5 km in diameter. The name "Hun Kal" means '20' in the language of the Maya. ==References==
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