What is the first sphere of heaven?

In the first sphere from earth, you find a great similarity in all other things, as well as in the inhabitants. Nearly all are drawn here on first entering the spirit world, as they are still charged with earth's magnetism, and need the chemicals nearest earth to sustain them. Very soon many are drawn higher by becoming more spiritualised with heavenly aspiration, and must then be sustained by a natural attraction. Those who remain longer are led to return to earth where they control mortals to carry out their habits and tastes acquired in the earth life—for they are still governed by their sensual or physical condition, and it is only by degrees that they can be withdrawn from its material associations.