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When (and why) was zero right ascension defined to be at the vernal equinox? Who established or defined this standard?

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    $\begingroup$ You may enjoy The Historical Development of Celestial Co-ordinate Systems. I'm still reading this article, but it makes sense for there to be a common origin for ecliptic longitude and right ascension. And an equinox point is a natural origin for ecliptic longitude. $\endgroup$
    – PM 2Ring
    Commented May 31, 2020 at 16:57

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