LOS ANGELES -- If you're a stargazer, you were treated to a once-in-a-lifetime spectacle Monday night. The two biggest planets - Jupiter and Saturn - aligned in the night sky, appearing closer than they have in centuries. The pair appeared like a double planet, a phenomenon astronomers call "the great conjunction," but the two gas giants are still 456 million miles apart. This phenomenon has also been dubbed a "Christmas Star" in reference to the celestial light that guided the three wise men to Jesus in the Christian Bible's nativity story. LA stargazers gather at Griffith Observatory for 'great conjunction' Stargazers gathered at the Griffith Observatory for a chance at getting a glimpse of the "great conjunction."