WhiteRaven is giving good advice.(As usual!) But one must be careful of Astrology. All is not as it may seem.
I spent time in Japan, and spoke with quite a few Astrologers.They were more concerned with the length of pregnancy than the actual birth.To them, the "conception" is the "key", not the birth.This is why most Japanese mothers (and Chinese!) keep a record of their pregnancy. Times vary. A "normal" pregnancy is forty weeks. But if, for instance, a birth in June is after a 36 week pregnancy, the birth "date" is calculated as in July!
Astrology is a very old practise. The real stuff is not that as published in newspapers and magazines!