In my opinion, I find it quite a coincidence that Gregory XIII had a dragon on his coat of arms and that he happened to be the one wanting the calendar changed, thus it was named after him. Matching right up with one of Daniel's prophecies, about the beast changing times and laws. (The law that was changed was the Sabbath.)
Daniel 7
25 And he shall speak great words against the most High, and shall wear out the saints of the most High, and think to change times and laws: and they shall be given into his hand until a time and times and the dividing of time.
At any rate, nighty, night.
LOL
We are through the looking glass here, Salve. Black is white, up is down, etc....