Did Jk Rowling choose her characters birthdays on?

purpose? Like does she believe in zodiac signs because Snape is said on wikipedia to be born on January and that's the zodiac sign of capricorn which fits him perfectly! http://www.astrology-online.com/capricrn.htm And Mggonigal was said on pottermore to be born in october, how ironic because october babies... show more purpose? Like does she believe in zodiac signs because Snape is said on wikipedia to be born on January and that's the zodiac sign of capricorn which fits him perfectly! http://www.astrology-online.com/capricrn... And Mggonigal was said on pottermore to be born in october, how ironic because october babies seem well suited for her!
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