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

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How did they count Sefirat Ha'omer in those areas when there was doubt, prior to our current calendar? [duplicate]

Following up on a comment from this answer excerpt: In conclusion, now that we have an established calendar and our celebration of two days Yom Tov is only due to the minhag of our fathers, as ...
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Outside Israel, why don't we count two days of the Omer consecutively? [duplicate]

Outside of Israel, we observe 2 days of Pesach because of keeping a custom that there initially was a doubt as to which day Pesach began. The mitzvah of Omer says that it begins "On the morrow of ...
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2answers
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“לְחֹדֶשׁ שְׁנֵים עָשָׂר” in the Megillah and Al Hanisim

As I was reading Al Hanisim this year, something odd struck me "לְחֹדֶשׁ שְׁנֵים עָשָׂר" - the 12th month. What struck me was that this year is a leap year so we actually celebrated Purim in the ...
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3answers
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Seeking additional information about the “seasonal drift” problem of the Judaic calendar

During my shul's annual *Tikun Leil Shavuot", I plan to give a short lecture about the "seasonal drift" affect of the Judaic calendar. See this Mi Yodeya answer for additional info. I could use some ...
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The story of the Minim and Boethusians; trying to fix the festival of Shavuot on Sunday

I've found different sources like the Mishnah, Babylonian Talmud (tractate Rosh HaShanah), Jerusalem Talmud, Tosefta etc., talking about the Minim and the Boethusians who wanted to fix the festival of ...
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3answers
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Why not two days of Rosh Hodesh, as we have two days of yontif?

The reason for two days of yontif (outside Israel) is based on uncertainty about the date due to distance from Jerusalem and time needed to travel to convey the news of when the month started. The ...
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1answer
70 views

Why some biblical holidays don't occur on certain days of the week?

I looked on the Hebcal website to see when the Erev Pesach will occur in the future (and also looked at the past), but found out that it's never a thursdag or sunday, did the Erev Pesach ever was or ...
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1answer
57 views

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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6answers
4k views

How Do I Know If it's a Hebrew Leap Year?

How can I tell if a given year is a Hebrew Leap Year? The simpler, the better. [Assuming we are using a fixed calendar, not like the "olden days".]
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2answers
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How to Reconcile if/when the Jewish Day Was to Begin at Sunset?

Question: Are there any historical documents that detail the differences in opinions on when the "Jewish Day" began? (Perhaps between Sadducee and Pharisee/Rabbinic definitions, etc). What the ...
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3answers
119 views

Passover duplicates on Shabbat 2 years in a row

Passover fell this year on Shabbat which is rare. It also fell last year on Shabbat. Two years in a row is incredibly rare. The question is in two parts: when has this duplication taken place ...
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2answers
54 views

Weekday Torah reading the same for two weeks when Yom Tov falls on Shabbat?

When Yom Tov falls on Shabbat, superseding the regular weekly Torah portion, does the Monday and Thursday weekday reading stay the same the week before and the week after the holiday? E.g., this year, ...
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2answers
65 views

Is it possible to read from 5 Parshiyot on 1 Shabbat?

On a regular Shabbat, we read from 2 parshiyot when we have a communal Torah reading -- one parsha in Shacharit and the next at Mincha. When there is a double parsha at Shacharit (such as ...
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3answers
215 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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4answers
439 views

Hours, minutes, and chalakim

On Shabbat preceding Rosh Chodesh, the time of the molad is generally announced in units of hours, minutes, and chalakim. However, minutes are not a traditional Jewish unit of time; rather hours are ...
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1answer
52 views

“Early” leap years [duplicate]

Mishneh Torah, Sanctification of the New Month 4:2 (Sefaria English translation with my modification on the word "Aviv"): עַל שְׁלֹשָׁה סִימָנִין מְעַבְּרִין אֶת הַשָּׁנָה. עַל הַתְּקוּפָה וְעַל ...
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2answers
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Donating to the poor ON Purim

In minyan this morning, the gabbai said that money given to the shul as matanot l'evyonim would be donated to a charity which will "distribute it to evyonim in Yerushalayim, on Purim." I live in the ...
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1answer
71 views

How can Australia celebrate Pesach at the same time of year as other countries?

The Torah commands that we celebrate Pesach in the spring time so how can Australia celebrate Pesach at the same time of year as other countries? While I suspect the answer is that they celebrate at ...
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2answers
420 views

Does Passover occur on the first full moon after the equinox?

Christians claim that Jesus was put to death on Passover eve Nisan 14 they make the date for easter based on the first full moon after the spring equinox(paschal full moon) This year Passover is not ...
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0answers
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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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Why do we need a separate celebration for Shushan Purim in walled cities?

Purim is celebrated on Adar 14 because that was the day the Jews rested after prevailing against their enemies. In walled cities, Shushan Purim is celebrated on the 15th because that was when the ...
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1answer
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Names of the days of the week

What are the Jewish names for each of the week days?
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1answer
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Parshat Ki Tisa on Shabbat Shekalim

According to my Artscroll Chumash, it appears that parshat Ki Tisa can not be the scheduled Shabbat reading on Shabbat Shekalim (I assume this because the potential maftir and haftarah readings listed ...
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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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Davening Riddle [closed]

With variations in the jewish calendar, how is it possible to daven maariv on nine consecutive nights and every shemoneh esrei is different from the other eight? Example: Thurs nite is a weekday, ...
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4answers
234 views

Why do we use Adar, specifically, for the Jewish leap year?

Why when we add an additional month to the year do we only add it in Adar? Why not have a second Cheshvon or a second Shevat, etc.?
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1answer
80 views

What is the source for observing Purim Katan?

As this year is a Judaic leap year, we shall be observing Purim Kattan ("little" Purim) on the 14 and 15 of Adar I (Feb. 24 and 25 on the Gregorian calendar.) (This holiday occurs every Judaic leap ...
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0answers
47 views

Looking for a computer program or method to list all weekday / Shabbat no-El_Maleh days

My shul has asked me to compile an annual list of all days when "El Maleh" (prayer said for yahrtzeit) is omitted. People in my shul know that it is said any day the Torah is read, meaning Mon., ...
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1answer
81 views

How can traditional calendar be correct? [closed]

Traditional calendar has two Shabbats in a row. For example, Passover 2008 was preceded by Shabbat. 1st day of Passover is a Holy Meeting and it is called a shabbat too. Calendar can't have two miqra ...
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1answer
160 views

Where is the source for assigning a pasuk to each year since creation?

I remember having been told that there are those who assign each of the 5845 pesukim in the Torah to each year since creation. This is from memory as I have not found the reference yet. Would anyone ...
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3answers
168 views

Mashiach in year 6000?

I have heard in various discussions that we have an idea that mashiach will come at the latest by year 6000. Is this a normative belief? Furthermore, is this a belief that is understood literally by ...
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5answers
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How do we know that the civil Saturday is the correct Shabbat?

Disclaimer: I am not a religious Jew, this question is only out of curiosity. I understand that observant Jews observe Shabbat from Friday night to Saturday. And from this question and this it seems ...
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2answers
270 views

Looking for a Niddah Calendar calculator

I am looking for a program that calculates the different significant dates for hilchos Niddah based on the information you give it. My criteria are as follows: Must be free Must be PC compatible ...
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1answer
279 views

Why does the torah give us exact dates for the flood?

This question asks why the flood didn't end on the 18th of Cheshvan (one year after the start). My question is more basic: why does the torah give us precise dates here at all? Bereishit 7:11 tells ...
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1answer
198 views

What is a ger's birthday in terms of Jewish astrology? conversion date or birth date?

In terms of Jewish astrological signs and influences on people, per Kabbalah, would a ger use their actual 'birth' date or their date of conversion which is considered a rebirth?
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3answers
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When exactly should an avel (mourner) not be davening before the amud?

An avel (mourner) if possible should also daven before the amud (be the chazan) on weekdays. But certain times of the year especially when tachanun is not said (but not every time) he should not be ...
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2answers
166 views

Time Parameters of Mishenichnas Adar Marbin B'Simcha

Is "Mishenichnas Adar Marbin B'Simcha" just for the month of Adar, and then you take a step down in simcha for Nisan? Or are you supposed to raise your level of simcha and stay there until Av, when ...
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1answer
775 views

Praying for rain in the Diaspora

Why on this year (and on other years that precede civil leap years) do we start praying for rain in the Diaspora (by inserting the phrase 'Vetein tal umatar") at maariv of December 5 and not maariv of ...
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3answers
652 views

Creation of State of Israel and birth of Abraham - 1948

According to the Jewish calendar, Abraham was born on the year 1948. The state of Israel was declared in 1948 according to the secular calendar. Is there any significance to this or is it just ...
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1answer
47 views

Is it accurate to count down years in Ancient Jewish calendar? [closed]

Do we say that the smaller the number date for BCE calendar the more recent the year? Count backward to go forward? And is it true that from 1BCE to 1CE is one year?
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1answer
88 views

Is there a zero year in the ancient Jewish calendar?

I have recently been informed that the ancient Jewish calendar does not count the year at the beginning of a century: no zero year. So for example 1999- 2001 is one year not two. This can be important ...
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0answers
149 views

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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2answers
825 views

Why do Jewish funeral homes tend to be the main supplier of Jewish calendars?

Perhaps, this question is too "trivial". It seems that Jewish funeral homes tend to be the primary "printer" and supplier of Jewish calendars. For decades, many yeshivot as well as shuls get the large ...
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1answer
132 views

247 year Jewish calendar cycle

I recently read on Matzav.com an article by Rabbi Dovid Heber discussing the 247 year cycle in the calendar. He mentioned that every 247 years the Hebrew calendar is exactly identical. Now in the ...
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1answer
87 views

What are the Jewish months exactly?

I am aware that the names of the months are derived almost directly from the Babylonian calendar and that the Chumash itself never mentions a month by name and instead refers to it by number. Later on ...
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1answer
163 views

Why was there a huge concern to assure that Hoshanna Rabbah is not on Shabbat?

This page lists 4 rules that may cause the first day of Rosh Hashannah to be postponed from being on the date of the molad Tishrei. One of the rules is: If molad Tishri occurs on Sunday, ...
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1answer
218 views

What are these marks with the numbers designating the Jewish years on this calendar?

I can see that the Hebrew is Elul 775 to Tishrei 776. What are those marks prior to the Hay and the Vav?
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2answers
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How are parshas dealt with during the leap year's leap month? Also on haftorahs?

The Torah is divided into parshas and read each Shabbat. So during leap year, how is it handled? For haftorahs, same question. Also there are some parashas that are 2ndary to the main ones ...
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1answer
74 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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2answers
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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 ...