NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Navigating Around Hills and Dips in the Ocean
From: Keith Williams
Date: 2003 Aug 19, 08:58 +0300
From: Keith Williams
Date: 2003 Aug 19, 08:58 +0300
George says: "It's possible to go from one value of g to another, always following > an equipotential path, and there will be changes in elevation above > the Earth's centre along that path, but being an equipotential path, > there will be no work done against gravity. None at all. In fact, this > is exactly what > happens when a ship travels from one latitude to another and from one > value > of g to another, over the oceans." Can we have further explanation of this? My brain tells me that moving along an isobar (to make a simple analogy) can't move you to an area of higher pressure. Are equipotential shells not analogous to isobars? Keith Williams
