“These globes may be figured as disposed in three pairs on the arc of an ellipse, with the middle globe at the midmost and lowest point; for the most part globes A and G – the first and seventh – are on the arupa (formless) levels of the mental plane; globes B and F – the second and sixth – are on the rupa (form) levels; globes C and E – the third and fifth – are on the astral plane; globe D – the fourth – is on the physical plane.
These globes are spoken of by H. P. Blavatsky as “graduated on the four lower planes of the world of formation”, i.e., the physical and astral planes, and the two subdivisions of the mental (rupa and arupa).
They may be figured:
This is the typical arrangement, but it is modified at certain stages of evolution.
These seven globes form a planetary ring or chain, and – if for a moment we regard the planetary chain as a whole, as, so to say, an entity, a planetary life or individual – that chain passes through seven distinct stages in its evolution;
the seven globes as a whole form its planetary body, and this planetary body disintegrates and is reformed seven times during the planetary life. The planetary chain has seven incarnations, and the results obtained in one are handed on to the next.
Every such chain of worlds is the progeny and creation of another lower and dead chain – its reincarnation, so to say.
Those seven incarnations make up “the planetary evolution”, the realm of planetary Logos.
As there are seven planetary Logoi, it will be seen that seven of these planetary evolutions, each distinct from the others, make up the solar system.”
Annie Besant
The Mark Of God: Understanding Your "I AM Presence" 