jd(jd=0, sg=ITALY)
public
Create a new Date object from a Julian Day Number.
jd is the Julian Day Number; if not
specified, it defaults to 0. sg specifies the Day of Calendar
Reform.
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def self.jd(jd=0, sg=ITALY)
jd = _valid_jd?(jd, sg)
new!(jd_to_ajd(jd, 0, 0), 0, sg)
end