Your honesty is refreshing. You can say whatever you want. I trust and have faith in the literal interpretation of the Bible. I take the Word of God over the word of man. But that's me. The Bible clearly states that a day is light into dark to light again (in at least three passages in Genesis). The day is used throughout the Bible as a time references. I'm unfamiliar with the way the Bible describes pi, so I can't compare the two issues.
There is a lot of interesting research out there about the literal interpretation of the Bible. It seems like you have a lot of questions and interest.
But you have not answered about the Bible's position on slavery. If the Bible is infallible, and is absolutely never wrong on anything, does that mean you approve of slavery in certain instances?