"There are actually 13 Zodiac signs but for the 12 promoted, here is some information, taken from the book below, written by a man who used to draw horoscope charts, and was deeply into astrology."
This is nonsense and anyone who uses the phrase "draws horoscope charts" doesn't know very much either.
In 1920, 99 years ago, astronomers, not astrologers, added a constellation to the zodiac they use for their own purposes. The signs are not the same thing as the constellations. REPEAT:: signs are not constellations in Western Tropical Astrology. They aren't. They have the same names which is hopelessly confusing for skeptics, all of whom think if 500 hundred people are named Bill, it must be one guy because they're all named Bill..
The signs begin at the vernal point, the point in the sky where the ecliptic intersects with the celestial equator in the east, then, moving counter clockwise along the ecliptic, the apparent path of the Sun around the earth, each sign occupies 30 degrees of arc. 360 degrees divided by 30 = 12. Not 13.
Some nitwit astrologers for whom high school never ended, and therefore thinking standing out for any reason no matter how stupid, is desirable, accept the 13th constellation as a sign. They're dumb, and fortunately, they are very, very, few in number.
Here is two interesting facts about astrology: 1) no skeptic understands anything about it correctly. 2) There are people who claim to be astrologers who shouldn't be listened to. The guy who "draws horoscope charts" is one of them. Astrologers stopped drawing charts over 30 years ago when the PC became ubiquitous.
I checked out the cited reference, What Your Horoscope Doesn't Tell You, by Charles Strohmer
Strohmer isn't an astrologer. He writes on religion. He needs to avoid astrology.