Let me answer quickly: this verse says that the light used by the moon is the same as the sun. 

> But in those days, after that tribulation, the sun shall be darkened,
> and the moon shall not give its light.  Mark 13:24

The moon's light in Greek (ancient Greek I think ) φέγγος αὐτῆς, means "its light", the word φέγγος means *same* , well , the words

φέγγος αὐτῆς could mean , same light .. which means when the sun darkens the moon will lose the same light ... so Yeshua said the moon borrows light , well you can find many translation the Greek lexicon is vast ... I hope this answers