Genesis 1 is the genealogy of the heavens and the earth.
It is an example of the standard ancient, near eastern practice in literature to begin a story and to separate episodes of a continuing story with a genealogy.
It is a misunderstanding to assume it is supposed to be a modern historical, chronological, report of events.
Also, considering vs 1 -3
Gen 1:1 In the beginning God created the heavens and the earth.
Gen 1:2 The earth was without form, and void; and darkness
was on the face of the deep. And the Spirit of God was hovering over the face of the waters.
Gen 1:3 Then God said, “Let there be light”; and there was light.
There is no indication of how long the earth was without form and void or how much time passed between it being in that condition before God said, "let there be light."
So, all the speculation about the meaning of the word "day", in order to determine how old the earth and the universe might be, is moot.
iakov the fool