1. Our 'scientific' definition of 'birds' was not the word available in Hebrew, Greek or any language back then so the definition used to refer to 'bats' is correct for that time - not an error - obviously the word "bird' means any creature that has wings and flies. Hence the so called 'error' is a reading back into the text of a foreign definition of a word - it's a common mistake made by some theological liberals who are trying to find fault with the Scriptures.
2. The reference to the sun setting is not an error - its the way we still talk in phenomenological language.
Cordially,
Seat yourself comfortably because there are about 1500 to 2000 more of them for you to work with if you're interested.
The bible is a man made document. It is full of the kinds of errors people make. It is no less valuable as an ethical and moral guide because of these errors and mistakes but it is worthless as a biology text.