Zodiac labels

[takrobat]

I am creating a new thread, as my previous thread was more focused on the images in the zodiac pages. But as I noted there, I find it interesting that a lot of the labels has "o" as the first glyph. We know that this is a common prefix, but I still think it is more than usual, so I did some analysis (which probably have been done before, but....)
I use the "H" transcription for this. There are 299 labels, this is because Gemini is missing 1 label: You are not allowed to view links. Register or Login to view.
According to my script 76.9% (230) of the labels start with "o". But this varies amongst zodiac signs. Aries have 29 "o", 1 "c", while saggitarius have only 15 "o". I was wondering if this was perhaps moving with time, but I see no clear indication of that, even though it kind of drops gradually. 
The script I wrote output:
aries        :  30 lines
  Starting letters: c:1, o:29

taurus      :  30 lines
  Starting letters: c:4, o:24, s:1, y:1

gemini      :  29 lines
  Starting letters: a:1, c:1, o:26, s:1

cancer      :  30 lines
  Starting letters: o:24, y:6

leo          :  30 lines
  Starting letters: *:1, c:2, d:1, e:1, l:1, o:22, r:1, s:1

virgo        :  30 lines
  Starting letters: a:1, c:2, e:2, o:21, s:1, y:3

libra        :  30 lines
  Starting letters: a:1, c:1, o:24, y:4

scorpius    :  30 lines
  Starting letters: a:1, c:3, d:1, k:1, o:20, s:2, y:2

sagittarius  :  30 lines
  Starting letters: c:2, e:1, o:15, q:1, s:1, y:10

pisces      :  30 lines
  Starting letters: c:1, d:1, o:25, s:2, y:1

------------------------------------------------------------
Total zodiacs: 10
Total lines  : 299


I have also created a graph to show it more graphically. 


As I said in my previous post, I am just looking at stuff. Feel free to guide me in any direction if anyone wants me to look at something specific, right now I am still where this is curious, but I have no "theory" of why this is the way it is.