Robert B Looking further down the list of 'Hohmann transfer orbit' references (HTO), I found the following two which are interesting - http://www2.jpl.nasa.gov/basics/bsf4-1.html http://liftoff.msfc.nasa.gov/academy/rocket_sci/satellites/hohmann.html The first describes interplanetary HTOs and supports my contentions. The second describes LEO to GSO and supports your contentions. Problem is, they are both NASA sites, and as we've been constantly reminded, NASA only tells lies, so where are we? Paul D ____________________________________________________________________________________ Yahoo!7 Mail has just got even bigger and better with unlimited storage on all webmail accounts. http://au.docs.yahoo.com/mail/unlimitedstorage.html