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Mariner 9

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Annotated elevation map of Opportunity landing site and some surrounding craters including Endeavour and Airy. The prime meridian is the right-hand edge of the coloured part of this image, Airy-0 is just below 5°S.

Airy-0クレーター火星の経度0度を定義した歴史的地点

Airy-0火星クレーター本初子午線
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