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# REDIRECT Armillary sphere
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# and Armillary
# REDIRECT Armillary sphere
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
# Equality of rights, the sphere of legislation and the judiciary
# Fraternity in the economic sphere
# REDIRECT Dyson 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.
A two-dimensional 3D projection # Perspective projection | perspective projection of a sphere
# The points on the sphere are all the same distance from a fixed point.
# The contours and plane sections of the sphere are circles.
# The sphere has constant width and constant girth.
# All points of a sphere are umbilics.
# The sphere does not have a surface of centers.
# All geodesics of the sphere are closed curves.
# 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.
# The sphere has constant mean curvature.
# The sphere has constant positive Gaussian curvature.
# The sphere is transformed into itself by a three-parameter family of rigid motions.
# Selection of a model for the shape of the Earth or planetary body ( usually choosing between a sphere or ellipsoid ).
# Start with a sphere.
# 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
# The sticky mass is then formed into various shapes ( usually a sphere or cube ).
# REDIRECT celestial sphere
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