http://www.newadvent.org/cathen/08531c.htm

There are some similarities between what is expected
at the rapture, Rosh Hoshannah and the Jubilee Year.
The following is from the above link.

"Holy Year of Jubilee

The ultimate derivation of the word jubilee is
disputed, but it is most probable that the Hebrew word
jobel, to which it is traced, meant "a ram's horn",
and that from this instrument, used in proclaiming the
celebration, a certain idea of rejoicing was derived.
Further, passing through the Greek iobelaios, or
iobelos, the word became confused with the Latin
jubilo, which means "to shout", and has given us the
forms jubilatio and jubilaeum, now adopted in most
European languages.

OLD TESTAMENT ORIGINS

For the Israelites (see HEBREW YEAR OF JUBILEE), the
year of Jubilee was in any case preeminently a time of
joy, the year of remission or universal pardon. "Thou
shalt sanctify the fiftieth year," we read in
Leviticus 25:10, "and shalt proclaim remission to all
the inhabitants of thy land: for it is the year of
jubilee." Every seventh year, like every seventh day,
was always accounted holy and set aside for rest, but
the year which followed seven complete cycles was to
be kept as a sabbatical year of special solemnity. . .
It was, then, part of the legislation of the Old Law,
whether practically adhered to or not, that each
fiftieth year was to be celebrated as a jubilee year,
and that at this season every household should recover
its absent members, the land return to its former
owners, the Hebrew slaves be set free, and debts be
remitted."

An excerpt from the following link indicates that 2004
could be a Sabbatical year and 2005 a Jubilee year.
The Jewish year changes to 5765 on Rosh Hoshannah
(mid-September).  Just another reason to look with
anticipation for the rapture this year!

http://www.biblestudy.org/gands/hdaybook/jubilee.html

"When Is the Jubilee Year?

The Jews today are in confusion as to Sabbatical years
and Jubilee years. True fifty-year Jubilee years were
only counted during Temple times. Some Jews believe
that every 15th and 65th years of the world era are
Jubilee years. Thus, 1955 and 2005 would be Jubilee
years. And 1976 and 1983 would have been Sabbatical
years."

(Note:  If 1983 was a Sabbatical Year, plus 21 (3 x 7)
makes 2004 a Sabbatical Year)