How do the moon and the sun function as symbols in the story?

The moon changing , allows the wife to finally see what was happening. I don't know about the sun, sorry.

Explanation:

1.the hosts on two opposing mountains stood,  

2.thick as the foliage of the waving wood;  

3.between them an extensive valley lay,  

4.o'er which the gleaming armour pour'd the day,  

5.when from the camp of the philistine foes,

6. dreadful to view, a mighty warrior rose; in the dire deeds of bleeding battle skill'd,