300 H&H Magnum

Good theory. Though I am thinking the comet and the planet are on a non-circular orbit around their sun.

Laws can be changed. Should be changed in this case. That silly custom will have been done away with by the time Cersei, Marge, and Arrianne have had their way in King's Landing. It should no longer be an issue upon her arrival.

Here is another interesting parallel. Bran's two older brothers were total failures. Robb and Jon completely failed. Those two boys were failures. They lacked the discipline. Both were oathbreakers. Dany's two older brothers were also failures. Rhaegar and Viserys were failures. Dany is the best possible leader for Westeros. She has the courage and the intelligence to become the best ruler those people will ever have.