From: Mark Knudsen
Date: 2018 Jan 8, 08:43 -0800
Question? There is a U Tube program were a man used a board with a wire to cast a shadow , he marked the points of the shadow with a pencil every couple of minutes than recorded the time. At the peak , shortest shadow he recorded thi time Ned used it to calculate from GMT for his longitude is this simalar to what you are doing with graph paper. If I remember he was only point something of a kalometer off. Comments please.