[The Barrow-Wight]

I don't know anything about astrology, but I know a bit about the calendars used by Hobbits and how they relate to our current calendar. When Tolkien said 1 March, he meant the first day of the third month of the Hobbit calendar (Rethe), which coincides with the 22nd of February on our modern Gregorian calendar. This still places him within the bounds of our current understanding of Pisces (19 Feb - 20 Mar), but only by a few days.

Likewise, Frodo and Bilbo shared the birthday of 22 Sep (22nd day of the 9th month), which corresponds to 14 Sep on our calendar. This would put the two hobbits firmly within the sign of Virgo (8/23 - 9/22) instead of right on the last day of being a Libra.

My question is, "Do birthdates that fall near the border of two signs share some characteristics of both signs (in Aragorn's case, mostly Pisces but a bit of Aquarius), or do the dates of a sign strictly confine a person to that sign?"