birthdays and timezones. (and the zodiac?)

I probably come back to this at least yearly.  Well, since moving back to the United States.  I was born in the Philippines at 5am on March 11 twenty-four years ago.  When it is 5am on March 11 in the Philippines, it is 3pm Central time in the United States, and it is March 10.  My birthday is March 11, but on March 10 in the U.S. it is already March 11 in Manila.  So, one could argue that I was born on March 10.  I normally don't pay attention to the zodiac or horoscopes, but I occasionally find them interesting.  It recently occurred to me that the date I claim as my birthday could change some things regarding these.  It would be interesting to find out what time zone horoscopes are based off of.  It seems that would make a difference in the results.  I also find it fascinating that I was born during a full moon.  It was a truly full moon on March 11, and only an almost full moon on March 10.  I'm fascinated somewhat by the way the phases of the moon effect the earth and thus find it interesting to see what phase of the moon I was born under.