This is an activity sheet that I created for students to use tomorrow before and after the eclipse. I've downloaded the free app "Lux Meter" to measure the visible light outside. Students can also use the site http://www.esrl.noaa.gov to find the location of the sun in the sky. in addition, students can also use protractors to adjust the placement of their phones to find the supplementary angle of the sun's location. This is my first upload to the site, please provide feedback. I hope it works for you.
Edit...use the Word doc, I realized the PDF did not have the elevation correct. The elevation of Rocky Mountain National Park. The correct elevation is on the doc, it's 9,905 feet above sea level.