def premier_da_la_annee(jd):
p = ephem.previous_fall_equinox(dublin.from_jd(jd))<EOL>previous = trunc(dublin.to_jd(p) - <NUM_LIT:0.5>) + <NUM_LIT:0.5><EOL>if previous + <NUM_LIT> < jd:<EOL><INDENT>n = ephem.next_fall_equinox(dublin.from_jd(jd))<EOL>nxt = trunc(dublin.to_jd(n) - <NUM_LIT:0.5>) + <NUM_LIT:0.5><EOL>if nxt <= jd:<EOL><INDENT>return nxt<EOL><DEDENT><DEDENT>return previous<EOL>
Determine the year in the French revolutionary calendar in which a given Julian day falls.
    Returns Julian day number containing fall equinox (first day of the FR year)