tyears = 1973:2009
E1 = EPOCHday(tyears, jd=1, origyr=1972 )
EPOCHyear(E1$jday, origyr=1972 )
E1 = EPOCHday(tyears, mo=12, dom=31, origyr=1972 )
EPOCHyear(E1$jday, origyr=1972 )
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