Participants (3450) ALL
#730
Daniel CastroCisneros, "Sun's Size"
Hermosillo, Sonora, Mexico (member of Buhos UNISON group)
Hermosillo, Sonora, Mexico (member of Buhos UNISON group)
"Image of the Sun obtained with a gnomon with pinhole; the size of the Sun help to calculate Earth-Sun Distance."
"Gnomon with a pinhole measuring 1.0 m high. The image is projected in a pize of paper and digitalized usin a cell phone."