Questions about calendars. The Jewish calendar is a lunisolar calendar that determines the dates of Jewish festivals.

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Where and when did the numerical time units (hours) originate? [duplicate]

The Torah states no numerical divisions for the day. The closest numeric we find is that there are 7 days in the week, and that the start of the "day" begins with "erev" (and there are debates on when ...
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1answer
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Acronym for ה׳תש״ע [closed]

I know that every Hebrew year has one or more acronym for it. What acronyms do we use for the year ה׳תש״ע? Google is not helping me.
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Why do we use the Babylonian month names? [duplicate]

Possible Duplicate: Why use Babylonian calendar instead of our own? The Torah refers to the months of the near numerically, the names we employ for things like contracts, birkat hachodesh ...
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Shemonei Esrei regarding the seasons in Divine Might

Every time I pray the Amidah, I get very hesitant regarding what season is appropriate for me to pray. I live in the southern hemisphere in a tropical climate. Therefore, we have one season dry and ...
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Why is 1 Elul / 1 Tishrei the New Year for livestock?

The first Mishna in Rosh Hashanah says that 1 Elul is the new year for livestock, i.e. I can only tithe one year's "crop" of livestock at a time, so 1 Elul delineates the herds. (Update: we follow the ...
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732 views

Why “hayom yom rishon”, not “echad”?

Rabbi Menachem Greenblatt (St. Louis, Missouri) mentioned at s'uda sh'lishis (Shabas parashas "Ki Setze" 5772) that the correct name for Sunday is echad b(a?)shabas, as is written in k'suvos and ...
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4answers
297 views

How often does Addar II happen?

I was sitting over dinner with the mispaha (family) talking about the calendar and I said that Addar 2 happens every seven years, but my dad said that it happens every four. So, my question is: how ...
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How do non-literalist Jews interpret the “year zero” in the Hebrew calendar?

As I understand, the Hebrew calendar is counted from the "date of creation". Currently you have the year 5774. In the Christian world there are some creationists who also believe that the world is of ...
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2answers
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Why is my molad-time chart off by a day?

The HaMaor Mikraos Gedolos chumash has a chart of molad (forecasted first visibility of the new moon in Jerusalem, based on averages observable to the naked eye, assuming Jerusalem local time; am I ...
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3answers
717 views

The 70 weeks in Daniel 9

How does one understand the 70 week prophecy in Daniel 9? When does the decree to rebuild Jerusalem take place, and how do you interpret the "seven weeks; and for threescore and two weeks" from that ...
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1answer
62 views

What is the real first month of the Jewish year?

The Torah passage explaining Rosh Hashana says: "In the seventh month, on the first day of the month, you shall have a rest-day, a day of remembrance, horn-blowing, and holy assembly. [...] The tenth ...
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1answer
172 views

What will Lubavitchers do in 2052?

There's a Chabad-Lubavitch custom of reciting a psalm of T'hilim corresponding to one's age. That is, for example, in one's fourteenth year of life (e.g. on his thirteenth birthday), he says the ...
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2answers
199 views

Significance of number 613 regarding the mitzvot

According to the Talmud (Makos 23b) "Moshe received 613 Mitzvos. They are 365 Lavim (negative commandments), corresponding to the days of the (solar) year, and 248 Mitzvos Aseh (positive ...
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1answer
120 views

What Hebrew date requires the most space to spell out in a Ketubah? [closed]

What Hebrew date requires the most space to spell out in a Ketubah?
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2answers
107 views

On which day in Teveis did this happen?

In Megilas Esther 2:16 it mentions that Esther was taken in Teveis to Achasverosh's palace. Does anyone know on which day of the month this happened?
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1answer
51 views

Seeking (a) web site(s) that discuss(es) Judaic calendar statistics

I am compiling a short shiur for my shul on Rosh Hashanna. I plan on discussing some items related to the Judaic calendar, with a focus on some statistics that I can eventually put into Excel and / or ...
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2answers
117 views

Secular Names for Days of the Week

Is there a problem using the secular names for the days of the week? If so, is it 1) because they originally come from Polytheistic gods or 2) simply because the people forbidding them are of the ...
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1answer
122 views

Where does 5774 fall in the 19-year cycle?

We are in a leap year, as indicated by the presence of Adar Bet. Leap years occur every third, sixth, eighth, eleventh, fourteenth, seventeenth and nineteenth years in the cycle. So how to tell ...
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1answer
46 views

Significance of 4 Teveis in Judaism

Is the 4th day of the Month of Teveis significant in Judaism? Looking for answers as to what characteristics (historical, numerological or otherwise) that is commemorated by or significant to Judaism ...
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1answer
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When does the year start in terms of saying “Ulichaporas Pasha” for a leap year?

When we add the words "Ulichaporas Pasha" during Musaf of Rosh Chodesh when it's a leap year, when is the year determined - Nisan or Tishrei?
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2answers
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Holocaust Rembrance Day(s)?

What is with the different Holocaust Remembrance Days? When I was a kid, my entire community observed Yom HaShoah. This came about approximately one week after Pesaḥ. Although I'm not totally sure, I ...
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1answer
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When is the end of the Tishrei holiday “season”?

(Inspired by this question) I'm curious if there is any discussion on when the Tishrei holiday "season" officially ends. Just off the top of my head, I'm curious if anyone recommends refraining from ...
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How to calculate 60 days from tekufat tishri for any given year?

I'm trying to pin down an algorithm for calculating when to start saying ותן טל ומטר in diaspora. (In Israel it begins 7 Cheshvan.) I've gotten that we need to know how many centuries passed since ...
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3answers
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Rambam Kiddush HaChodesh - Chapter Six - halacha 5

a copy of a few lines from the halacha: Similarly, when the days of a lunar year are counted in groups of seven, according to the weekly cycle, there is a remainder of four days, eight hours, and 876 ...
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Eating new grains on the 17th vs the 18th of Nisan

The Shulhan 'Aruch (OC 489:10) states: אסור לאכול חדש אף בזמן הזה בין לחם בין קלי בין כרמל עד תחלת ליל יח בניסן ובארץ ישראל עד תחלת ליל יז בניסן "It is forbidden to eat new (grains) even ...
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What sources are there for the meaning of Yom HaMeyuchos (2nd Sivan)?

Ohr Sameach gives the chronology according to Rashi of the giving of the Torah. Early the following morning, the 2nd of Sivan, Moshe goes up Mt. Sinai for the first time. He is instructed to ...
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1answer
113 views

How do I write in Hebrew for a Ketubah, “On the first day of the week, the thirtieth day of Adar I in the year fifty-seven seventy one”

How do I write in Hebrew for a Ketubah, "On the first day of the week, the thirtieth day of Adar I in the year fifty-seven seventy one"? Question was asked by Stephen Spiegel, I'm just posting it ...
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1answer
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During Purim Meshulash, why does the Seudah take place on Sunday?

When Shushan Purim falls on Shabbat, residents of Jerusalem spread the observances of Purim over three days: Megillah reading & meshloach manot on Friday, Al HaNissim and Purim Torah reading on ...
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1answer
108 views

What is the Sod HaIbbur?

What is the Sod HaIbbur (secret of impregnation)? I have seen it discussed in many places including the Pirkeu D'Rebbi Eliezer (8th chapter?) in reference to the intercalation for the lunar months of ...
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Between Shemini Atzeres and the Shemoneh Esrei 9th blessing's prayer for rain

In the Shemoneh Esrei, the line "who makes the wind blow and the rain descend" is added to the Second Blessing from Shemini Atzeres. The request to "give dew and rain for a blessing" is not added to ...
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What is the significance of a Blood Moon in Judaism?

Is it true that the appearance of a Blood Moon is an omen in Judaism? And why it happens to be coinciding every time with a Jewish holiday since quite a while? I would like to know about the facts and ...
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Concerning the time when Esther must be read

The first Mishnah in Tractate Megilla says: מגילה נקראת באחד עשר, בשנים עשר, בשלושה עשר, בארבעה עשר, ובחמישה עשר--לא פחות ולא יתר. The Megilla is read sometimes on the 11th, 12th, 13th, 14th, ...
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Did the people who followed the triennial cycle celebrate “Simchat Torah” in the same manner as those who followed the annual cycle?

I noticed this related question that briefly discusses Simchat Torah, but it mainly answers those that follow the annual cycle. People following the annual cycle clebrate Simchat Torah on a Yom Tov ...
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Is there a reference that explains the literal meaning and etymology of the names of the Hebrew months?

Is there a reference that explains the literal meaning and etymology of the names of the Hebrew months? I am looking for something that explains both the common Babylonian names as well as the Tana"ch ...
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110 views

What are the months of Jewish civil and religious calendar?

I understand that Jewish religion has two calendars; one is Civil for Kings, childbirth, contracts etc. and second for festivals. what are the months of these calendars and how they are related ...
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208 views

Making up a synagogue calendar manually is tedious work. Which software can do the calculations automatically?

Lots of synagogues print up a customized calendar every year. (Sample.) Such a calendar includes shul-specific information (e.g. service times and maybe a weekly class or two) and general information ...
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Did Brit with rainbow happen in Kislev?

I read on torahvort.com in their article on Kislev that the Brit with Noach about the rainbow happened in Kislev. We know from the end of Ber 8:27 that Noach left the ark on the 27th of the 2nd month, ...
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What will happen when our set calendar ends?

In a recent conversation I was told that the current Jewish calendar was only set till the year 6,000. There was conjecture as to what will happen after that time (assuming Moshiach has not yet ...
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Why can we do Tashlich until Hoshana Rabba

One of the reasons to do Tashlich, according to Chabad.org is: "Another reason for saying Tashlich next to a river is because Rosh Hashanah is the day when we coronate G‑d as King of the Universe. ...
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The connection between Tishrei and Tevet

Can anyone steer me towards resources which explore a connection or relationship between Tishrei and Tevet (I assume, on a mystical level). Both months have a fast day on the 10th day and the full ...
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If a Beis Din Makes a Mistake When Calculating Kiddush HaChodesh, Does it Count?

On one hand, the Rambam says (in 2:10) Once the court sanctifies the new month, it remains sanctified regardless of whether they erred unwittingly, they were led astray [by false witnesses], or ...
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What is the date ending the 700 years mentioned in these midrashim?

Based on this answer I was able to have some extra fun reading over Shabbat. First, I would like to say, that I was amazed as to how much of the material I was allready familiar with, mostly from ...
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When is Avraham's birthday?

I saw in a popular book a suggestion that Avraham was born on Rosh Chodesh Tevet. Does anyone have any backing sources for this?
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Correspondence between 365 negative commandments and days of the year?

There are 365 negative commandments which correspond to the days of the (solar) year (see Makos 23b; Tanchuma Ki Seitzeh 2). Apparently the prohibition of Gid HaNasheh (sciatic nerve) corresponds to ...
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7answers
146 views

Books on the significance of the months in the Jewish calendar

I am looking for books/sefarim (Hebrew or English) that discuss the different months of the Jewish year, and their overall significance in relation to: Zodiac Signs Tribes Chagim Animals ...
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4answers
685 views

Why do we count years from the date of Creation?

Why do we count years from the date of Creation? I intend two sub-questions here, of which the second is far more interesting, so please answer it: Whence did this tradition originate? Why do we ...
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1answer
182 views

Is is prefered to have the Pasach meal on the first or second night?

I remember being told that the Seder can be on either the first or second night. Is this true, and if so, is it prefered for it to take place on one over the other, or are they both equal? Edit: The ...
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142 views

Is Jewish birthday the same every lunar year

I understand the Jewish birthday is calculated on the lunar year, which could cause the birthday to drift back and fourth along the lunar calendar. But supposing the child was born, say, first day of ...
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3answers
104 views

Significance of 3 Teveis in Judaism

Is the 3nd day of the Month of Teveis significant in Judaism? Looking for answers as to what characteristics (historical, numerological or otherwise) that is commemorated by or significant to Judaism ...
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1answer
155 views

Was there a song about the year 5773 being special?

I recall as a kid hearing a tape with some song that went, "in the year tav-shin-ayin-gimel..." [5773], does that ring any bells? What was supposed to be special about that year?