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# REDIRECT Armillary sphere
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# and Armillary
The Armillary sphere # History | spherical astrolabe, long employed in medieval Islamic astronomy, was introduced to Europe by Gerbert d ' Aurillac, later Pope Sylvester II.
# and sphere
# The sale of local produce, e. g. palm kernels, to Europeans opened up a new sphere of economic activity ; in particular it crated an increased demand for agricultural labour ; slavery was a way of mobilising an agricultural work force.
# Of all the solids having a given volume, the sphere is the one with the smallest surface area ; of all solids having a given surface area, the sphere is the one having the greatest volume.
# The sphere has the smallest total mean curvature among all convex solids with a given surface area.
# Selection of a model for the shape of the Earth or planetary body ( usually choosing between a sphere or ellipsoid ).
# Bend each strip and attach the other end of each strip to the sixth opposite the first end, so that the inside of the sphere at one end is connected to the outside at the other.
# a sphere: used in: Association football ( also called soccer in some countries ) and Gaelic football
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