an imaginary line on the surface of the earth connecting all points at which the declination of the magnetic field of the earth is zero.
[ 1860-65 ]
an imaginary line on the surface of the earth connecting all points at which the declination of the magnetic field of the earth is zero.
[ 1860-65 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012