On Thu, 1 May 1997, Lawrence D. Lopez wrote:
> Does anyone have a handle on the effect of the earth's gravity on the
> figure of a mercury flat?
Good ol' sag formula r^2/2R = (6*25.4E-3)^2/2/6.378E6 = 1.8 nm for 12"
mercury flat (1 lambda = 550 nm).
-- Jim Burrows: (206)244-2933, fax -0294
-- E-mail: burrjaw@halcyon.com
-- Seattle: WGS84 lat 0.828547, long -2.135692 (rad)