Astronomers use the principle of parallax to measure distances to the closer stars. Here, the term parallax is the semi-angle of inclination between two sight-lines to the star, as observed when the Earth is on opposite sides of the Sun in its orbit.
Ernest Rutherford discovered that atoms contain mostly empty space, with his gold foil experiment. Bhor discovered that the electrons are not randomly placed around the nucleu â¦ s.
Sodium was discovered by Sir Humphrey Davy in England in 1807. He  discovered that he could separate out the sodium from compounds by  using electricity.otassium was discovered by Sir Humphrey Davy in 1807 Lithium was discovered by Johan August Arfvedson in 1817 Sodium was discovered by Sir Humphrey Davy in 1807. 6 people found this useful.