This may be a crazy thought, but to a degree I think modern science can be tied in with Christianity, despite popular belief. In the Holy Bible, the book of Genesis says in chapter 1:3-5
"3 And God said, "Let there be light," and there was light. 4 God saw that the light was good, and he separated the light from the darkness. 5 God called the light "day," and the darkness he called "night." And there was evening, and there was morning-the first day."
Now when you read on into it farther, it says in 1:14-19
"14 And God said, "Let there be lights in the expanse of the sky to separate the day from the night, and let them serve as signs to mark seasons and days and years, 15 and let them be lights in the expanse of the sky to give light on the earth." And it was so. 16 God made two great lights-the greater light to govern the day and the lesser light to govern the night. He also made the stars. 17 God set them in the expanse of the sky to give light on the earth, 18 to govern the day and the night, and to separate light from darkness. And God saw that it was good. 19 And there was evening, and there was morning-the fourth day. "
So The Sun, Moon, and stars were not created until day 4, according to the Bible. So if you were to say that the Sun and Moon were there in the beginning according to the Bible, you are FALSE. So we ask ourself, ok then, what was the light. I honestly don't know what this light was, but it could be that before the 4th day, Thousands of years could have passed because we measure the Earths complete rotation, to see the day, then night, then day again, one days length, 24 hours. But before the Sun, before the 4th day, what was the measure of time? Well, does God go by our time...no. That is why prayers are answered in God's time not ours, whether they be minutes, hours, days, months, or years. So maybe to say that God created the day in literally 7 days is true, or you could look at it like the first 3 days, thousands or millions of years could have passed. Or even after the sun was created man wasn't created until day 6 to govern over creation, so maybe time wasn't judged until day 6. Who knows....That is just my opinion on modern science and Christianty.