Geodetic Zodiac
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In astro locality work the circular zodiac we use in the heavens is projected onto the circular globe pf the Earth. This is in essence an arbitrary arrangement, however it does seem to work. Evidence has now accumulated that starting the zodiac, i.e. the 0 Aries point, at 0 degrees of longitude is a valid thing to do. However this is optional and you can specify a different starting point here.
Each sign then occupies 30 degrees of longitude. However you can specify. in which direction this "terrestrial zodiac" unfolds - the signs can flow (Ar, Ta, Ge, Cn etc) eastwards or westwards from the starting point.