It does, it tells me where the two great lights are & the stars, it tells me how the earth is unmovable & so much more.......
It doesn't, because it is not a science textbook.
You say that the Bible says that the earth is fixed; anchored.
When God inspired the prophets to write that, was he making a factual, scientific statement? If he was and he wants us to know that the earth is immovable - which you say means, "anchored" - what is it anchored to?
A thing can only be anchored to something that is stronger than itself. A boat can't be anchored to a piece of seaweed, or lifebuoy; the anchor is thrown overboard so that it embeds itself in the seabed.
So what is the earth anchored to?
Truth has nothing to fear from questions, experiments and so on; why have scientists not confirmed the, apparent, scientific statement of the Bible that the earth is fixed and unmovable? Wouldn't that be cool if the Bible had made a scientific statement and, thousands of years later, scientists had to say, "yep; God was right"?
They haven't confirmed it because it's not a scientific, factual statement. You can't even answer the question, "what is the earth anchored to?" You can't show me from the Bible, because it's not in there and you can't give a scientific answer because it's not true. So you have made, yet another, statement with no evidence whatsoever.
And just because Genesis doesn't say, "then God caused the planets to move around the sun", doesn't mean that it doesn't happen.
The Bible doesn't tell us how God created angels either, but he did.