Cool Project (not mine): #SkylightCeiling: everything overhead (planes, stars, ISS) projected on your ceiling. Aviation stuff is picked up with a sub-second delay via receiver (eg a $40 RTL-SDR Blog V4 radio). https://www.reddit.com/r/nextfuckinglevel/comments/1tvmcin/i_live_in_the_take_off_path_of_sfo_and_built_a/ https://www.skylightceiling.com #aviation #planes #DIY #Astronomy #HamRadio