Liz Robinson, Exec Dir Philadelphia Solar Energy Assn, on the local and nation-wide September 21st Sun Day celebrating solar energy fun. Planet Philadelphia airs on 92.9 FM in NW Philadelphia & gtownradio.com, 4-5:00 PM ET the 1st & 3rd Friday/month. Find out more at  https://www.planetphiladelphia.com/ Please support Planet Philadelphia environmental radio show and Gtown Radio at https://gtownradio.com/donate/.