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    Re: Zodiacal coordinates
    From: Andrew Nikitin
    Date: 2012 Sep 14, 07:27 -0700

    > zero starts at some boundary of a zodiacal sign, but then, what determines the convention?

    For the purpose of denoting longitude ecliptic is split into 12 parts exactly 30 degrees each starting at spring equinox. These regions are named after zodiacal constellations and back in the good old days somwhat corresponded to them. Today, because of precession they are pretty far away from their namesakes.

    Wikipedia has a list of sign names ad their corresponding longitudes.
    http://en.wikipedia.org/wiki/Zodiac

    In your example 24 lib=204 degrees longitude.
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