13th July, according to some sources, was the Ancient Egyptian Festival to celebrate the Birthday of Ra. Since Ra was the God of creation this could be interpreted as the day the universe was created!

Ra was also associated with the Sun and healing so perhaps it is no coincidence that Roman's celebrated Apollo on the same (equivalent) date, especially since we know which came first and one of the ways Roman's integrated their lands was to Romanise local customes and festivals just as later the Christians did. For example attributing Jesus birth at the same time as the ancient festival of Yule.

Apollo's significance among Romans

Apollo became significant among Romans when a young Augustus Caesar, chose Apollo as his own god, and attributed his victory over Antony and Cleopatra to Apollo's superiority over the Egyptian Deities! Augustus is said to have described Apollo as: "Governor of Roman destiny; master of the sun; archer; augur; averter of pestilence; and giver of sound morals to the young.