What is the difference

And God said, Let there be light: and there was light. And God saw the light, that it was good: and God divided the light from the darkness. And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day. Gen 1:3-5

And God said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years: And let them be for lights in the firmament of the heaven to give light upon the earth: and it was so. And God made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also. And God set them in the firmament of the heaven to give light upon the earth, And to rule over the day and over the night, and to divide the light from the darkness: and God saw that it was good. And the evening and the morning were the fourth day. Gen 1:14-19

Between what took place on day one and day four? Was day one twenty four hours? How so? IYO, Was the earth rotating on it's axis? Was day four twenty four hours? How so? IYO, Was the earth rotating on it's axis?

YLT of Acts 26:18 with words in italic removed and added a comer following that.
to open their eyes, to turn from darkness to light, and the authority of the Adversary unto God, for their receiving forgiveness of sins, and a lot among those having been sanctified, by faith that, toward me.

Is that verse more relative to the darkness and light spoken of above in 3-5 or 14-19 or are is it relative the same to both?