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Armillary sphere
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An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model o…

Northern Hemisphere
The Northern Hemisphere is the half of Earth that is north of the equator. For other planets in t…

Cantino planisphere
The Cantino planisphere or Cantino world map is a manuscript Portuguese world map preserved at th…

Western Hemisphere
This article or section appears to contradict itself on the definition of its subject ; its own s…

Linguasphere Observatory
The Linguasphere Observatory (or the Observatoire, based on its original French and legal title: …