Calcutta and most of eastern India will be witness to the spectacle of Mars and Saturn nudging each other, with a crescent moon watching over them, this weekend. This rare conjunction after sunset on July 6 will be topped by Regulus (Megha), the brightest star in the Leo constellation, making an appearance in the same patch of the western sky. After dusk on July 10, Mars and Saturn will be just 0.38 degrees apart, which is the closest they'll get until 2022. According to astronomers, the two planets were last seen near each other