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| Geography of Pluto ： ウィキペディア英語版 |
Geography of Pluto
The geography of Pluto entails the delineation and characterization of regions on Pluto. Plutonian geography is mainly focused on what is called physical geography on Earth; that is, the distribution of physical features across Pluto and their cartographic representations. On 14 July 2015, the ''New Horizons'' spacecraft became the first spacecraft to fly by Pluto. During its brief flyby, ''New Horizons'' made detailed geographical measurements and observations of Pluto and its moons.
==Orientation==
Pluto may be defined as having retrograde rotation and an axial tilt of 60 degrees, or prograde rotation and a tilt of 120 degrees. Following the latter convention (the right-hand rule), the hemisphere currently in daylight is the northern one, with much of the southern hemisphere in darkness. This is the convention used by the International Astronomical Union (IAU) and the ''New Horizons'' team, and their maps put the sunlit hemisphere on top. However, older sources may define Pluto's rotation as retrograde and therefore the sunlit side as the southern hemisphere. East and west are also swapped between the two conventions.〔For example, 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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