So, I recently joined a stargazing club, and for our summer activity, we're supposed to use a telescope, a photoresistor, and a multimeter to measure the luminosity of the moon. I know that luminosity can be calculated with the equation, L = σ AT 4, and that brightness can be measured with the equation b=L / 4πd2. But I don't understand how I could convert convert the data that I recorded in ohms to luminosity. The club president said that we wouldn't need to use physics beyond advanced physics from the high school level, but I don't remember this from my classes. t noticed that some moon sites used illumination percentages (i.e. illumination 54% (what would the value of 100% illumination even be?), or relative brightness percentages (i.e. relative brightness 3%). how would I be able to tie all of these values, equations, and percentage together just by obtaining the brightness of the moon perceived by a photoresistor, measured in ohms. P.S. I know that my location is roughly 393,216.24 km from the moon. I would sincerely appreciate any help at all, for I am completely clueless. Thanks so much in advance!