Bhishma Ashtami is seen on the "ashtami" (eighth day) of the Shukla Paksha (brilliant fortnight of moon) of the time of "Magha" in the Hindu calendar.Bhishma Ashtami or "Bhishmashtami" is a Hindu celebration devoted to "Bhishma" of the immense Indian epic 'Mahabharata'. It is trusted that Bhishma, otherwise called 'Ganga Putr Bhism' or 'Bhishma Pitamaha' withdrew from his spirit on this picked day.