Dhoomketu

Ashok and Mona Arora wait on their roof with their children, Suman and Sahil, to view a comet that Mona says appears every seventy years. Halley's Comet, the most famous naked-eye periodic comet, follows an orbital period of roughly seventy-five to seventy-six years, with its twentieth century appearances occurring in 1910 and 1986. Neither date aligns with the 1978 setting of the series, and the stated seventy-year cycle does not correspond to Halley's actual period. The reference may function as a fictional plot device loosely inspired by Halley's Comet rather than a depiction of an actual astronomical event visible in 1978.