Galileo Galilei drew our Sun's spots, at about the same time each day over the course of 37 days in June and July 1612 (skipping two days and yielding 35 drawings). a casual review of these drawings makes evident that our Sun rotates.
NASA launched the Solar Dynamics Observatory (SDO) spacecraft to geosynchronous orbit (around Earth) in 2010. the Atmospheric Imaging Assembly (AIA) project on board SDO photographs our Sun every 15 minutes (24/7/365) using four multi-wavelength telescopic cameras (and NASA posts the images at http://sdo.gsfc.nasa.gov/data/aiahmi/).
i selected 35 NASA photos of our Sun (SDO/AIA 171), one per day around noon GMT, from June and July 2013, each image corresponding in date (+401 years) to one of Galileo's drawings. i inverted these images and made 35 drawings of our Sun's spots (401 years after Galileo) based on these images. this cascading accordion presents those 35 drawings, side-by-side, in sequence (3.63" height by width expandable to 10.75 feet).
full color inkjet print (mixing 11 pigment inks) on superheavyweight matte plus paper (starting with the 17x36” print, which is cut, hand-folded, seamed, pressed, and sleeved in studio)
