Toward Ecosophy

The East Indians, I think, talk of both sheaths and bodies within. Frawley speaks of three bodies — physical, astral, and causal — in Indian philosophy; Gurdjieff speaks of one more, the Divine Body.
In occult philosophy (I’m just starting on The Occult Philosophy Workbook), how many bodies do they speak of?
Is the etheric body equivalent to the astral body; and if not, would they both have channels?

Thanks for your help,

E.S.