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Solar tube

Projection solar tube

Easy construction solar tube for observation

cortesy of: L'Aula del Cel (Sky classroom), Observatory
Astronomical, University of Valencia, Spain

http://www.uv.es/obsast/in/divul/auladelcel.html


black cardboard with pinhole

a cardboard tube (Miquel Collado)

white cardboard with an opening in the tube

toothstick to track sun