Related Program: Our Island Universe Our Island Universe: Halloween is an Astronomical Holiday! By Greg Jenkins • Oct 28, 2019 Related Program: Our Island Universe ShareTweetEmail Credit skyatnightmagazine.com October 31 is known as Halloween in much of the western world. Its roots, however, lie in astronomy. What is the connection between Halloween and the stars? #OurIslandUniverse Listen Listening... / 2:30 ShareTweetEmailView the discussion thread.