Madurai: The Tamil Nadu Science Forum, is organising a planet gazing event on Sunday, to help people witness a rare celestial event - the conjunction of the Jupiter and Saturn, the biggest stars in the milky way galaxy. President Tamil Nadu Science Forum, Madurai M Rajesh, said that it was a once in a lifetime opportunity to see such rare event as it would next appear in the skies only in 2080. The TNSF is organising the event near the Annamalai theater in Simmakkal on December 21 between 6pm and 8pm. People can be relieved to watch the sky to see the conjunction of Jupiter and Saturn. It became known as the ‘Christmas Star’ in the conjunction of Jupiter and Saturn.