work of the Jewish oral law, sets this day aside as the new year for
calculating calendar years and sabbatical and jubilee years. Rabbinic
literature describes this day as a day of judgement. God is sometimes
referred to as the 'Ancient of Days'. Some decriptions depict God as
sitting upon a throne, while books containing the deeds of all humanity
are opened before Him.

Rosh Hashanah table set with symbolic foods.
Days of Awe
The
Jewish year 5769 begins at sunset this September 29th in the Western
calendar. With a young Los Angeles rabbi, Sharon Brous, we delve into
the world and meaning of the approaching Jewish High Holy Days — from
the new year of Rosh Hashanah through Yom Kippur's rituals of atonement
— a span of ten days known as the Days of Awe. Rabbi Brous is an
energetic voice in a Jewish spiritual renaissance that is taking many
forms across the U.S.

A shofar made from a ram's horn
The term "Rosh Hashana" does not appear in the Torah, but is used in the Hebrew Bible in Ezekiel 40:1 in general reference to the "beginning of the year."[6] Leviticus 23:24 refers to the festival of the first day of the seventh month as "Zicaron Terua" ("a memorial with the blowing of horns").

A shofar in the Yemenite Jewish style. (Photo by Olve Utne (Olve)
Numbers 29:1 calls the festival Yom Terua, ("Day of blowing the horn") and defines the nature of animal sacrifices that were to be performed.[6][7] The Hebrew Bible defines Rosh HaShana as a one-day observance, and
since days in the Hebrew calendar begin at sundown, the beginning of
Rosh Hashanah is at sundown at the end of 29 Elul.
The rules of the Hebrew calendar are designed such that the first day
of Rosh Hashanah will never occur on the first, fourth, or sixth days
of the Jewish week[8] (ie Sunday, Wednesday or Friday).
Since the time of the destruction of the Second Temple in Jerusalem in 70 CE and the time of Rabban Yohanan ben Zakkai, normative Jewish law appears to be that Rosh Hashanah is to be celebrated for two
days, due to the difficulty of determining the date of the new moon.[6]CE.[9] Orthodox and Conservative Judaism now generally observe Rosh Hashanah for the first two days of Tishrei, even in Israel where all other Jewish holidays dated from the new moon (except Rosh Hodesh - the New Month, on which Rosh Hashanah falls,) last only one day. The two days of Rosh Hashanah are said to constitute "Yoma Arichtah" (Aramaic: "one long day"). The observance of a second day is a later addition and does not follow from the literal reading of Leviticus. In Reconstructionist Judaism and Reform Judaism, some communities observe only the first day of Rosh Hashanah, while others observe two days. Karaite Jews, who do not recognize Jewish oral law and rely solely on Biblical authority, observe only one day on the
first of Tishrei, since the second day is not mentioned in the Torah. Nonetheless, there is some evidence that Rosh Hashanah was celebrated
on a single day in Israel as late as the thirteenth century
Laws on the form and use of the shofar and laws related to the religious services during the festival of Rosh Hashanah are described in Rabbinic literature such as the Mishnah that formed the basis of the tractate "Rosh HaShana" in both the Babylonian Talmud and the Jerusalem Talmud. This also contains the most important rules concerning the calendar year.[10]
In Jewish liturgy Rosh Hashanah is described as "the day of judgment" (Yom ha-Din) and "the day of remembrance" (Yom ha-Zikkaron). Some midrashic descriptions depict God as sitting upon a throne,
while books containing the deeds of all humanity are opened for review,
and each person passing in front of Him for evaluation of his or her
deeds.
https://en.wikipedia.org/wiki/Rosh_Hashana
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from..https://www.crystalinks.com/yomkippur.html
metaphysical...
Rosh Hashanah
During the energies of Rosh Hashanah there is an opening in the cosmos
that creates a virtual time tunnel in which our thoughts and meditations
allow us to travel back into the moments of the past that require
correction. It is also our opportunity to choose the seeds that we wish
to plant for the coming year.
So in Elul, we eliminated negativity.
On Rosh Hashanah we illuminate our containers or vessels that hold the
Light in one shot over two days. The first day is for removing harsh
judgements, the second day is for nullifying soft judgements.
*Before each Rosh Hashanah we need to make a list of what we want, our
priorities, and ask for everything to be different.
Ten Days Between Rosh Hashanah and Yom Kippur
This period is known as Aseret Ymei Teshuva or the Ten Days of
Repentance.
It is a period of cleansing/testing. It is time to act differently,
reflecting the list you made prior to Rosh Hashanah and proving that you
have a different consciousness. One way to help this process along is to
minimize ego. What better way to do this than by asking for forgiveness,
by apologizing to people you've hurt.
*Make a list of proactive actions and attitudes that parallel the life
you'd like to have. Make a list of people you've hurt or have been
unkind to. Ask for apologies, pay them compliments whatever you can do
to turn things around.