Well, the period of 225 million years, which is the time taken for the sun to orbit the galactic center, is termed a galactic YEAR. Note the galaxy does not rotate as a rigid body, like the earth.
Also, I can see you are not a very careful student of Genesis. The heaven and the earth, as well as light, and day and night also, are created on the First Day. However, the firmament ( heaven ) is created on the Second Day, and this is famously problematical with respect to day and night having been created on the First Day. So all in all, we are pretty much free to form whatever correspondences we wish.
I will say as I have always said, from my own secular viewpoint, that the Seven Days of Creation in Genesis 1 correspond amazingly well to our scientific understanding of the evolution of the universe, and life on earth, and really I don't see why this isn't seized upon as a vindication of the wisdom or correctness, or what you will, of the Genesis account.
Where exactly in Genesis does it say the heaven and earth were created on the first day??? Does not say on what day the heavens and earth were created. Gen 1:1 said they were created in the beginning and no date is given for when the beginning was. Then there is that big word And, in verse two, which continues to describe an undated event wherein the earth became a waste. Does not tell us how long it took to make the waste and how long the waste lasted.
What starts in Gen 1:3 is an environmental clean up and no dated is given for when that first day started, further Peter says that one day with the Lord is as a thousand years to us, not a 24/7 day.
'Cause they're stuck with a (24 hour) day notion.
And the idea that if any modern observation doesn't square with a literal interpretation of the currently approved Biblical version of Genesis, the entire Bible is (gasp, strangle) a LIE and all of the morals and ethical principals in it disappear in a puff of satanic smoke.