From: the_cassels_at_comcast.net
Date: Tue Sep 23 2008 - 20:44:21 PDT
Experiment Report for the Eratosthenes Project on http://youth.net/ School Name: Open Door Christian Academy School Location: Fort Washington, PA USA Email Address: the_cassels_at_comcast.net Experimenter: Joel Cassel Latitude 40.15592 Longitude: -75.19416 Distance to Equator: 2763 mi Measured shadow angle in degrees: 40.1265 Calculated Earth circumference: 24789 mi Comments: The umbral shadow was measured and the elevation angle of the upper limb of Sun was computed. But to get the most accurate value for the latitude, the radius of the Sun was added. For September 22, 2008 at 12:53 pm Eastern Daylight Time, the radius of the Sun determined from our location was 15.93 arcminutes.