the imaginary spherical shell formed by the sky, usually represented as an infinite sphere, the center of which is a given observer's position.
[ 1875-80 ]
the imaginary spherical shell formed by the sky, usually represented as an infinite sphere, the center of which is a given observer's position.
[ 1875-80 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012