This is an old Athiests gotcha question. They usually ask it in context that the followers of Jesus are simple or uneducated and always were.
The thinking goes like this. If Jesus was God then why did he not tell mankind scientific truth concerning the cosmos? And why is it not recorded in the bible? I have never had a single one even try to rebut these versus when they see them and if it's good enough for athiest it should be enough here.
Jesus of course knew the earth was round and told us. He said in the "night" (a specific time at some point on the planet) and then mentions 3 different pairs of people doing things that happen at three different times on the earth, therefor the earth is round. I list them in their broadest terms.
In the field -8am til 4pm
At the mill - 4 pm til 12pm
In bed - 12pm til 8am
Luke- 17:34 I tell you, in that night there shall be two men in one bed; the one shall be taken, and the other shall be left. 35 Two women shall be grinding together; the one shall be taken, and the other left. 36 Two men shall be in the field; the one shall be taken, and the other left.
Marcmc