I posted about this a few weeks ago, but I am trying to determine if there is some point south of Seattle (along the same longitude) in the continental United States with a larger geodesic distance from Fort Lauderdale. The problem is written more formally in terms of spherical coordinates. Using a formula for geodesic distance I found online (images shown), I used Desmos to plot the geodesic distance as a function of the longitude of the point near Seattle. The distance seems to oscillate when this angle is varied, but can someone check this for accuracy?
