• Phil Todd uploaded a new app: Regiomontanus Probl… 8 years, 1 month ago

    We seek the place on the earth’s surface where a vertically suspended bar (or the rings of Saturn) look the biggest.

    A machine to solve this problem consists of a mass fixed to the earth’s surface and a couple of bars attached to the mass and constrained to pass through the ends of the bar.  A spring between the bars pushes them apart.

    The machine reaches equilibrium when the bars are as …