Plumb Bob Problem at 34.5° North Latitude

[merksican]

A plumb bob does not hang exactly along a line directed to the center of the Earth's rotation. How much does the plumb bob deviate from a radial line at 34.5° north latitude? Assume that the Earth is spherical.

I have no idea where to go or what to do.

Thanks

 

[Delphi51]

Something to do with precession?