That's my point. 'Coriolis force' was invented to make it appear that Newtons laws were valid in an Earth based frame. On Thu, 21 Nov 2013 18:06:54 -0700, Don Latham wrote: >Coriolis ain't a force :-) >> >> Newtons laws are NOT valid in a noninertial frame. (That's why the >> Coriolis force >> was invented.) >> Bill Beam NL7F