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amjd 

        # Date.amjd

(from ruby core)
---
    d.amjd  ->  rational

---

Returns the astronomical modified Julian day number.  This is a
fractional number, which is not adjusted by the offset.

    DateTime.new(2001,2,3,4,5,6,'+7').amjd    #=> (249325817/4800)
    DateTime.new(2001,2,2,14,5,6,'-7').amjd   #=> (249325817/4800)

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