"Sphericity of the Earth" . "spherical in shape" . "sphericity of earth" . "Spherical Earth#Islamic astronomy" . "spherical earth" . "Aristotle's argument" . "spherical shape of the Earth" . . "Sphaira" . "Spherical Earth#History" . "Earth's sphere" . "spherical Earth" . "spherical shape" . . "his theory" . "earth is round" . "Earth was spherical" . "spherical self-supporting earth" . "world is a sphere" . "sphericity of the planet" . "Earth is spherical" . . "sphericity of the Earth" . "Spherical Earth" . "Earth is round" . "round shape" . "the Earth is a sphere" . . "earth was spherical" . "Earth's sphericity" . "sphere" . "Spherical Earth Theory" . "spherical" . . . . "Spherical Earth" . "spherical like the heavens" . "The Earth is often approximated as a sphere" .