ABSTRACT

Eqs. (10) are based on [4] but as given here are simplified by neglecting some terms of v ery small magnitude. Eqs. (11) and (12) are based on [5] and ignore the eccentricity since it is found that a l t e r n a t i v e expressions given in [4] while more precise, give results which are only marginally different, and at the same time their complexity prevents an expli c i t sol u t i o n for A r being obtained. Eqs. (11) and (12) are always conservative when compared with the more precise solution.