NavList:

For some reason the images I had attached do not show up on the Google Groups site so rather than sending them a third time here is the link to them on the archive.

http://www.fer3.com/arc/m2.aspx?i=109606

gl

Gary LaPook wrote:

I am attaching an excerpt from AFPAM 11-216, Air Navigation, which may help explain the behavior of gyros and the Foucault Pendulum. These both exhibit the "apparent precession" due to "earth rate" which make them appear to change direction at a rate of 15.04º per hour times the sine of the latitude. The Foucault Pendulum, hanging in the Pantheon in Paris, is located at 48º 50' 47" north latitude, the sine of which is  .7529 multiplied by 15.04º per hour  produces a rate of apparent precession of the pendulum of 11.32º per hour. The information plaque near the pendulum states that it changes 11º per hour, obviously rounded to the nearest whole degree for the tourists. Coriolis is not involved since the Pantheon has not moved across the surface of the earth since its foundations were laid in 1758 so its ground speed is zero.

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