Celebrating the Ancient Science of the Summer Solstice Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email June 20, 2016: The full moon rises behind a tree next to the ruins of the ancient marble Temple of Poseidon, built in 444 BC, at Cape Sounion, southeast of Athens, on the eve of the summer solstice. ( Petros Giannakouris / Associated Press ) Produced by Dana Roberson Produced by PRI and WNYC