Hello,
12 or 13 signs suffered from the same thing rainbows did... 7 was the number, 7 sins, 7 seas, 7 celestial bodies etc...6 was a bad number...so we added a colour...
13 wasn't a good number, and if your talking astrology that's not going to sell well... Its not like they didn't know.
Go back to the Greek's, mystery and math were interwoven and it took a longtime to ditch the habit.
Steve
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