Questions tagged [calendar]

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

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Program to find likelihood of potential calendrical occurrences

Someone asked me over kiddush about the frequency of the following scenario: Shabbat Rosh Chodesh In a leap year On Adar II In such a case, R"CH would also be Shekalim, so that might be faster ...
Noach MiFrankfurt's user avatar
4 votes
1 answer
150 views

"Riot Act" Haftarah for Kedoshim -- When Will We Read it Again?

As discussed previously, while we avoid it whenever possible, this year (5784 / 2024) most Ashkenazim will read the actual Haftarah for Kedoshim: Yechezkel Ch. 22, "Inform the bloody city of all ...
Shalom's user avatar
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2 votes
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Where did Samson Raphael Hirsch write "the catechism of the Jew is his calendar"?

There are lots of articles and books that say "Samson Raphael Hirsch famously wrote 'the catechism of the Jew is his calendar'" - but what is the mareh makom?
Simcha Daniel Burstyn's user avatar
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Two festival days in diaspora [duplicate]

Is having to observe two festival days in the diaspora a minhag or takkanah? Is it still binding today?
Mikayah Yisrael's user avatar
2 votes
3 answers
137 views

How did Nissan stay in the spring before the exodus?

B”H Nowadays, since the exodus, we have the Beis Din occasionally add a leap month to keep Nissan in Chodosh haaviv, or at least rely on the set calendar. What did people do in the beginning of ...
B''H Bi'ezras -- Boruch Hashem's user avatar
1 vote
1 answer
156 views

Four Gates - ארבעה שערים

The Tur OH 428 describes a system for finding the year's calendar based only on (a) the molad of this year's Tishrei, and (b) knowing which of last year, this year, and next year are regular or leap ...
MichoelR's user avatar
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Is there a Hebrew Calendar discussion place? [closed]

Well, is there? I mean a Torah-observant place, if possible, where they discuss the math and the system behind the current calendar, original sources, perhaps the history involved in it as well (the ...
MichoelR's user avatar
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3 votes
1 answer
175 views

Which days the holidays occur on

Has anyone put together a list of how often each event in the Jewish calendar occurs on a given day of the week? For instance, Yom Kippur happens X% on Shabbat, Y% on Monday, Z% on Wednesday, etc.? I ...
Daniel Kagan's user avatar
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1 vote
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In Israel, is there an official body or the only officially recognized body that calculates the Hebrew calendar [duplicate]

In Israel, is there an official body or the only officially recognized body that calculates the Hebrew calendar that establishes the conversion relationship between the Hebrew calendar and the ...
Buttergum Star's user avatar
1 vote
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Why has Tisha b'Av begun on Saturday night so often recently?

I write this in summer of 2023 (5783). This year Tisha b'Av begins on a Wednesday night. However, in looking back over recent years, I notice that the observance of Tisha b'Av began on a Saturday ...
mweiss's user avatar
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When did R’ Hillel make the calendar?

I noticed that the Sefer HaChinukh (§4) attributes the calendar to Rabbi Hillel II, whom the mechaber says was the son of Rabbi Yehudah HaNasi. I have never before encountered the idea that Rabbi ...
Shimon bM's user avatar
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1 vote
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Is there a Hebrew Calendar backdated to 500 B.C. or earlier, in an importable format like CSV or JSON?

I'm putting together a program that will allow many different calendars to be correlated via Julian Day so that world events, personal notes, or even scriptural passages can be associated with ...
RAB's user avatar
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Why does the Mishna refer to Sunday as "after Shabbat"?

The Mishna in Megilla 1:2 uses varying terminology to refer to days of the week: מְגִילָּה נִקְרֵאת בְּאַחַד עָשָׂר, בִּשְׁנֵים עָשָׂר, כֵּיצַד. חָל לִהְיוֹת יוֹם אַרְבָּעָה עָשָׂר בַּשֵּׁנִי, ...
Shalom L'olam's user avatar
2 votes
1 answer
106 views

Why is a 3 day Yom Tov permissible, but Shabbos and Yom Kippur cannot be on adjacent days?

If Rosh Hashana were to fall on Wednesday or Friday, then that would result in Yom Kippur being on Friday or Sunday. The calendar was designed to avoid this happening since the sages deemed having ...
user avatar
5 votes
1 answer
192 views

Do the Arabs count to the moon, too?

The Talmud famously says (in a Baraita on Sukkah 29a) that the Jewish people calculate our calendar by the moon (lunar calendar), and the Nations of the World use the sun (solar calendar). How is this ...
Naftali Tzvi's user avatar
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Bracha on Kiddush Hachodesh

Did the beit din make a bracha each month on the mitzvah of kiddush hachodesh in the times of the Sanhedrin? If yes, what was the language of the bracha?
Sammy Nassimi's user avatar
3 votes
2 answers
126 views

Significance of Torah day starting at sunset, vs secular day starting at sunrise

This is a very general question, and I hope for some general answers. However, in order to focus it, I would like to specify one point. In the secular world, the day starts with "waking up" ...
Rabbi Kaii's user avatar
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Are there any opinions of a deadline for Moshiach later than the year 6000?

As discussed on this question, there are Talmudic opinions (e.g. in Rosh Hashana 31a and Sanhedrin 97a) that Moshiach must be here by the year 6000 AM (whether stated explicitly about Moshiach or ...
A L's user avatar
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4 votes
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120 views

July 4th in relation to the Jewish calendar

I was wondering if anyone has any sources that discuss the fact that July 4th, 1776 was 17 Tamuz 5536. Is there any correlation between the Declaration of Independence and the Destruction of Jerusalem?...
Chatzkel's user avatar
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1 vote
1 answer
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Concurrent calender or timing of Passover in the time of the late 2nd temple

I have read in secondary literature that the calendar or the regulations, in particular on the celebration of Pesach found in the rolls of Qumran differ from the Rabbinic tradition that is observed ...
SDG's user avatar
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Does a formalized date system exist for Judaism?

I am a software engineer and currently thinking about dates/times. In programming, all dates are in the Gregorian calendar system, and things start to break down when you get to dealing with CE/BCE. ...
Lance's user avatar
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9 votes
3 answers
519 views

Making my own Jewish calendar with paper and pencil

I would like to make my own Jewish calendar on paper with pencil ( using the help of programming for the more difficult calculations, ofcourse). How and where do I begin. Who makes the annual Jewish ...
Mars Sojourner's user avatar
4 votes
0 answers
114 views

Could the Jewish Calendar be changed because of climate change?

It seems that certain parts of the Jewish calendar are based on specific observations. I found this on Wikipedia, about the old observational methods to adding leap months and it made me wonder if ...
ldrg's user avatar
  • 141
2 votes
2 answers
335 views

Why is there no Ta'anit Esther Katan?

In a leap year, Purim is marked in the second Adar. In the first Adar, the 14th is noted as Purim Katan and the day after, as Shushan Purim Katan. The implications are limited (basically) to slight ...
rosends's user avatar
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4 votes
1 answer
203 views

Is the TorahCalc Molad Calculator accurate?

I have been making an excel spreadsheet that calculates molads. I started from the Molad for Tishrei in Year 1 Anno Mundi. Based on various websites (including TorahCalc), the Molad was on Tuesday at ...
Joshua Pearl's user avatar
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1 vote
0 answers
95 views

When was the first Jewish leap year?

What number year within the 19-year cycle was the year of Yetziyat Mitzrayim -- if that was the mechanism used in the midbar to keep Pesach in the Spring and alternatively, if the cycle wasn't what ...
rosends's user avatar
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3 votes
1 answer
237 views

Longest interval between readings of haftarah for Shabbat Rosh Chodesh

When Rosh Chodesh falls on Shabbat, a special haftarah (Isaiah 66) is read. However, in our fixed calendar certain months can never have Rosh Chodesh fall on Shabbat (Kislev, Sivan). For certain other ...
Joel K's user avatar
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1 answer
112 views

What is my Zodiac sign? [closed]

I was born on the 25 of Tishrei 1981 at approx. 5:30 PM. According to most secular astrologers I am considered to be a Libra/Scorpio cusp sun sign (Oct. 19-25). Tishrei is considered the month of ...
dpearl2121's user avatar
3 votes
2 answers
433 views

How and why does a Jubilee year cause Rosh Hashanah to take place on the 10th day of the month?

How and why does a Jubilee year cause Rosh Hashanah to take place on the 10th day of the month? Ezekiel 40:1 reads "on Rosh Hashanah, on the tenth of the month". Rashi asks and answers, &...
ninamag's user avatar
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2 votes
1 answer
775 views

How does one write Hebrew dates in short?

I'm trying to write down some of my friends' Hebrew birthdates, and because there's a bunch of them, I'm doing it in short. So 8 Tishrei 5763 would convert to 1/8/63 or ח׳ א׳ תשס״ג. (I think; I'm not ...
generallyconfuzzled's user avatar
0 votes
2 answers
134 views

Looking for the source that connects the days of the week to the sefirot

I found a picture of it, but I absolutely cannot find the title. I remember reading about certain months correlating to din, some rachamim, the rest judgment is pending. So, I'm hoping this book has ...
Kfir's user avatar
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0 votes
1 answer
311 views

Zodiac of Adar I

The zodiac sign of the month Adar in a non-leap year is Pisces (Dagim). But what kind of Adar I, which is in a leap year? Two months cannot have the same zodiac sign.
Dankl-Franl bar Uri-Hirschl's user avatar
1 vote
1 answer
145 views

When did the Cutheans undermine the lighting of signal fires to announce the new moon?

Back when the months of the Jewish calendar were determined by observations of the new crescent moon, eyewitnesses would bring their testimony to the rabbinical court in Jerusalem, and the court would ...
Ruminator's user avatar
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3 votes
2 answers
94 views

Climate and growing season in Iron Age Israel and Judah [closed]

Jan A Wagenaar, Origin and Transformation of the Ancient Israelite Festival Calendar, Harrassowitz Verlag, Wiesbaden 2005, proposes that the Feast of Unleavened Bread was originally in the month of ...
Mockingbird's user avatar
0 votes
0 answers
51 views

Is there somewhere I can find a list of just Rosh Chodesh for the year in Gregorian with one and two-day RC?

It would be convenient if I could find a list of RC for the year, such as 5781 2020/2021: Rosh Chodesh Sh'vat 1/14 Th Rosh Chodesh Adar 2/12-13 F S ... But this is what I've found: https://...
Nissim Nanach's user avatar
0 votes
1 answer
124 views

Date/Week of Creation off by a day?

Question: If we believe that Sunday is Yom Rishon of Creation, then what do we do with the given date of Creation being Monday, October 7, 3761 B.C.E. according to our current calendar? Are there ...
kosherpork's user avatar
5 votes
1 answer
94 views

Sources for Rav Saddia Goan on set days for Pesach

Rashi in Pesachim 58b mentions and rejects an opinion that in the days of the Tannaim the rules for which day of the week Pesach and (Rosh Hashana) can fall out, לא בד"ו פסח, were already in ...
Mordechai's user avatar
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0 votes
2 answers
1k views

What is the relation between the month Nisan and the spring equinox?

I'm searching for the relation between Nisan and the spring equinox according to Scripture. I know of the texts Genesis 1:14, Exodus 12:2-3, Leviticus 23:15 and Deuteronomy 16:1. I find multiple ...
Jan's user avatar
  • 109
1 vote
0 answers
19 views

Finding the daf for a day in history [duplicate]

Is there any online app (or simple process of calculation) that can indicate which daf was studied for any calendar day in Daf Yomi history?
Shimon bM's user avatar
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0 votes
1 answer
110 views

What is the original source for Yahrtzeit customs?

There are various customs and even halachot associated with yahrtzeits, such as saying kaddish, getting called to Torah, lighting candles, fasting, serving as a prayer leader, giving charity, ...
user avatar
0 votes
2 answers
97 views

The New Year in Tishrei?

Why does this Gregorian to Hebrew calendar converter show Elul 29 as the first day of the new Jewish year? I have not ticked the "After Sunset" box. It converts September 8, 2018, to Elul 28,...
pairunoyd's user avatar
0 votes
0 answers
30 views

Why aren't the two days of Rosh Hashannah structured as every other Rosh Hodesh? [duplicate]

I don't recall the exact location Rambam's Mishneh Torah, but he discusses that during the time of Sanhedrin, if witnesses came before sundown of the 30th day, then that day was considered Rosh Hodesh,...
DanF's user avatar
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5 votes
1 answer
661 views

What is the א"ת ב"ש ג"ר calendar mnemonic?

The Gemara Arakhin 9b discusses certain rules of the calendar. Specifically, it mentions that Rosh Hashana will always be on the same day of the week as the day of the Omer (the 2nd day of Pesach), or ...
H. Eugene Walters's user avatar
0 votes
1 answer
96 views

Confuse about the date

From this website, I get: 14th of Nisan, 3793 = Fri, 1 April 0033 To make easier, assumed that the sunset is always exactly on 6.00 pm. So, 14th of Nisan duration is from 6.01 pm to 6.00 pm and 1 ...
karma's user avatar
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3 votes
0 answers
47 views

Apparent contradiction if Elul was made full when necessary

The Gemara Rosh Hashanah 19b says: והאמר רבי חיננא בר כהנא א"ר מימות עזרא ואילך לא מצינו אלול מעובר לא מצינו דלא איצטריך הא איצטריך מעברינן ליה Didn’t Rabbi Chinana bar Kahana say that Rav said: ...
H. Eugene Walters's user avatar
0 votes
2 answers
1k views

How to determine Sabbath day in the Jewish calendar?

I'm trying hard to understand it by reading the internet, but still I fail to elaborate what is in my mind as I am still unable to understand it. First, I would like to propose the things I know about ...
karma's user avatar
  • 379
3 votes
3 answers
235 views

Could the Hebrew calendar calculations have been know since the time of Moses?

Many years ago, I read (non-Jewish source, without explicit external references) that the calendar calculations have actually been in effect since Moses, but were kept in secret for many centuries. ...
Ray Butterworth's user avatar
2 votes
1 answer
129 views

How many days are there in each year of the 304th Metonic cycle? [closed]

I need the number of days per year for my continuous Hebrew calender.
Julius Ronquest's user avatar
1 vote
1 answer
492 views

What is the starting date of the current Metonic cycle? [closed]

I am setting up an extensive hebrew calendar from hebrew year 3000.
Julius Ronquest's user avatar
4 votes
1 answer
208 views

How difficult would it be to make a simple Hebrew/Jewish Calendar covering the last 25 years with no access to the Internet?

How difficult would it be to make a simple Hebrew/Jewish Calendar covering the last 25 years using paper and pencils (including days of the week and corresponding Gregorian dates), with no access to ...
AmethystMaria's user avatar

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