2 Answers

I believe you are referring to this. 

Joshua 10:13
New King James Version (NKJV)
13 So the sun stood still,
And the moon stopped,
Till the people had revenge
Upon their enemies.
Is this not written in the Book of Jasher? So the sun stood still in the midst of heaven, and did not hasten to go down for about a whole day.

This could not have happened (the earth standing still). In order for the sun and moon to stand still, the earth would have had to stop revolving. Scientists today say that this would tear the earth apart if it were to happen. A look at ancient records show that heavenly bodies standing still was common terminology used back then. 

Example:

In the State Archives of Assyria volume X, report 145 says, "The 30th day became 'long.' In Volume VIII report 310 says, "IF in Adar (XII) the sun stands still in the middle of noontime: the land will experience siege (and) misery." These reports show us that terms like "the sun or moon stood still" were commonly used to describe certain conditions of heavenly bodies that they observed. It does not mean the earth stopped rotating. http://www.bibleandscience.com/bible/books/genesis/genesis1_sunstoodstill.htm

God, this puts me to sleep, please rescue us from bible-bashers.