Santa Maria degli Angeli ( Rome) sun passage

Santa Maria degli Angeli (Rome) sun passage across a meridian line at solar noon 24 April 2015 obliquity data the spot of sunlight (actually an image of the sun) is created by a small hole high in the southern wall of the basilica; when the spot is centered on the 3. 4cmwide brass meridian line (which runs northsouth), the sun is due south and it is solar noon (not 12:00 on a clock) one of 23 such movies taken by a University of Washington (Seattle, USA) class throughout the spring of 2015 for the purpose of measuring the obliquity of the ecliptic (the tilt of the Earth s axis) and how it has slightly changed since the meridian line was built by Francesco Bianchini in 1702 br, br,