If Bhishma departed on Makar Sankranti then what is Bhishmashtami?

Transcript

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We hear that Bhishma left his body in Makar Sankranti.
What is Bhishma Ashtami? Bhishma Ashtami is the day when Bhishma was born and he lived for a long, long time, several generations of his years passed on. And then eventually when he departed from the world, that was Makar Sankranti. So, Makar Sankranti falls generally on a fixed date, that is 14th January, whereas Bhishma Ashtami falls slightly later, that is generally speaking sometimes in February or March, usually February.
So, they are two distinct events, one marking the birth and the the departure from this world of Bhishma. Thank you.