This solargraph traces the path of the sun over the space of 5 months, one streak for each day. You can see cloudy periods and the many sunny days between mid January and mid June 2009. More on Solargraphs and how-to links at http://antwrp.gsfc.nasa.gov/apod/ap090115.html and http://antwrp.gsfc.nasa.gov/apod/ap090626.html