mikeh, on Nov 28 2008, 05:37 PM, said:
Their movement relative to each other is negligible.
It is true that due to precision of the Earth's rotation axis, the zodiac signs have moved some thirty days relative to their location 3000 years ago which are still used by astrologers. But this is besides the point IMHO since the zodiac calendar is just a division of the year into twelve equally long months, for practical purposes. One might have called those months M1,M2...M12 but someone apparently got the idea of naming them after star formations which are close to the Sun's position during the respective months. In fact the ecliptica crosses thirteen star formations (the twelwe zodiac signs plus Cygna), although this is arbitrary since one could obviously have chosen to divide the sky using other star formations. They vary in span from some ten days to some 50 days.
So if someone says he/she is born in the virgo sign, it just means "late summer" (or "late winter" on the southern hemisphere). It wasn't really related to stars in the first place (apart for a naming convention), so it's no big deal that it's even less related to the stars making up the virgo sign today. (Besides, at the Northern latitude I suppose one could be born under e.g. Ursa Major rather than those tropical signs. But again, it doens't matter, it's just a naming convention and always was).

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