Are you an Ophiuchi?
Modern astronomers don't divide the sky the same way ancient astronomers did. According to modern star maps, the sun cuts through a 13th constellation, Ophiuchus the Serpent Bearer, between Nov. 30th and Dec. 17th. Astrologically speaking, if you were born between those dates you're no longer a Sagittarian, you're an Ophiuchi! But that's another story....
This story is about what really happens when the sun enters the zodiac's 13th house: An interstellar wind hits our planet.
Full story here