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Questions tagged [calendar]

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

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What is the significance of the fact that every month that has a Biblical holiday in it is a 30-day month?

Rosh HaShanah, Yom Kippur, and Sukkos are all in Tishrei, which has 30 days. Pesach is in Nissan, which has 30 days. Shavuos is in Sivan, which has 30 days. What is the significance of this fact,...
DonielF's user avatar
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5 Iyar vs. 10 Adar

In Jewish tradition, we generally commemorate the ends of wars rather than their beginnings (e.g./i.e. Chanuka, Purim). The commemoration of the rebirth of Israel as the Jewish homeland in the past ...
Loewian's user avatar
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Cutting nails before Yom Tov

BSD I know that it says in Shulchan Aruch one shouldn't cut one's nails on Thursday (really two days before Shabbat) in deference to the Shabbos. Does this apply to Yom Tov as well? Meaning, should ...
TreeKing's user avatar
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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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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
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What if two communities had two different Shabbat days?

Imagine this: One community, A, keeps Shabbat on what we identify as Saturday. However, another community, B, for whatever reason, actually keeps Shabbat on what we identify as Sunday. These two ...
rosenjcb's user avatar
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Yakkov living in Egypt 17 years - connection to 210 years of servitude

Parshas Vayechi starts off that Yaakov lived in Egypt for 17 years. I was thinking that 17 years x 12 months = 204 months. Usually in 17 years there are 6 leap years which would increase the total ...
Gershon Gold's user avatar
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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
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Video course on Jewish Calendar

I made an (elementary) video on the Jewish Calendar, which goes through the basic principles from beginning to end, and actually uses them to calculate the full calendar for 5780. It came in just ...
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Where does Ramchal's idea of circulating calendar come from?

I am in search of any source preceding Derech Hashem, 4:7:6 (Sefaria Translation): חגיגת החגים הזמניים: ואולם מלבד הקידוש הזה הנשער במדריגותיו כפי מדריגת קדושת הימים יש עוד ענינים פרטיים מיוחדים לכל ...
Dr. Shmuel's user avatar
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Why are Creation and the Mabul not commemorated independently?

Our calendar marks days and dates important to our existence but they all start from the Exodus from Mitzrayim which makes sense because A -- that's when we started fixing a calendar that related to ...
rosends's user avatar
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For how long was there confusion about the date of a holiday?

The second day of Yom Tov outside of Israel was caused either by the length of time it took messengers to get to far away communities and tell them when the new month was declared or the confusion ...
rosends's user avatar
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Why are agricultural requests based on holiday timing?

There are a few changes to the amida which reflect the changes in the seasons -- we add (or change to) mashiv haru'ach umorid hagashem (or geshem) at Shmini Atzeret (and back at Pesach) and switch TO ...
rosends's user avatar
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Does the proclamation of the New Moon by Beis Din have an effect on nature?

I found in this celebratory volume, p 172 (haoros.com/download.asp?kovetzID=1086&ext=pdf) והנה הרא"ה בספר בדק הבית שלו הובא בש"ך יור"ד סי' קפ"ט סקי"ג הסכים עם קושיית הרמב"ן, ולפיכך כתב שיש ...
Avrohom Yitzchok's user avatar
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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 ...
DanF's user avatar
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Why are the daily tehilim divided as they are?

How were the daily starting and ending points for weekly and monthly readings of all of tehilim chosen? Are they just chosen to make them all approximately the same length, or are there specific ...
Daniel's user avatar
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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 ...
rosends's user avatar
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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 ...
Ben's user avatar
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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 ...
avi's user avatar
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What was done with the orders of the cohanim during a leap year?

In 1 Chronicles chapter 24 David set out orders for the cohanim to serve in the Beis Hamikdash. What he established is intuitive for a 12 month year, but what was done in a 13 month year? If possible, ...
Ken Goss's user avatar
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Why Kaddish for a parent is said for eleven months?

This answer cites a source which explains that Kaddish for a parent is customarily not said for 12 months so as not to imply a parent's status as that of "wicked." Not wanting to label a parent ...
rosends's user avatar
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System of counting months in Noach

Going through Noach with the help of Rashi, there are 3 different systems of counting months. From (Tishrei|Nisan) 1 2 3 From (Kisleiv|Sivan) when the rain stopped From (Cheshvan|Iyar) when the rain ...
Heshy's user avatar
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Why doesn't our decrease of joy extend beyond Tish'a B'Av?

Citing from here There is a famous Mishnah that is cited towards the end of Masechet Ta’anit (4:6) that states: “Mishenichnas Av, Mema’atin Besimcha” “When the month of Av arrives, we ...
DanF's user avatar
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2 votes
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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 (...
DanF's user avatar
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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, ...
Noah Santacruz's user avatar
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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 they ...
ertert3terte's user avatar
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2 votes
2 answers
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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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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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1 vote
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110 views

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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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
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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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1 vote
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101 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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1 vote
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Torah confusion between "daylight" and "a day"

The Torah uses the same word יום in the same verse to denote both "daylight" and "24 hours": וַיִּקְרָא אֱלֹהִים לָאוֹר יוֹם וְלַחֹשֶׁךְ קָרָא לָיְלָה וַיְהִי־עֶרֶב וַיְהִי־בֹקֶר יוֹם אֶחָד׃ ...
Al Berko's user avatar
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1 vote
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Are anniversaries celebrated in Adar I or Adar II?

For those who celebrate anniversaries, or for calculating the end of Shanah Rishonah, if a couple gets married in Adar of a non-leap-year, when is the anniversary celebrated in a leap year? Is it in ...
DonielF's user avatar
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1 vote
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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 ...
Levi's user avatar
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What factors were used for determining leap years while the Israelites were in the desert?

I am trying to "co-ordinate" Rambam"s explanation of how to determine Judaic leap years with a key verse in the Torah. Ranbam states in Mishneh Torah, Sanctification of the New Month 4:2: Mishneh ...
DanF's user avatar
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1 vote
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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., ...
DanF's user avatar
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1 vote
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279 views

Menorah with uneven spacing

The following assumes lighting an additional candle for each day of Chanukkah: Two may light in a single Menorah for the first three days of Chanukkah; each in his end of the Menorah. This does not ...
Adám's user avatar
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1 vote
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107 views

Not making a wedding on the first 3 days of a month

I've heard there is a custom (practiced in various kehillas, I heard Belz is one of them) to not make a wedding on the first 3 days of a month (meaning alef, beis, or gimmel of a particular month.) ...
Yehoshua's user avatar
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1 vote
1 answer
160 views

Adopting idolatrous Babylonian name of Month Tamuz

Jerusalem Rosh Hashana 6a דא"ר חנינה שמות חדשים עלו בידם מבבל R'Hanina said: the names of the Months were brought with them from Babylon The Gemmorah explains the process of adopting the ...
Al Berko's user avatar
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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
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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
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50 views

Why not say Shir Shel Yom in the evening?

I took a look at two questions: One, which focused on WHY we say Shir Shel Yom included the claim of the Chashukei Chemed in the answer, that "אבל הוא הדבר אשר דברתי דמה שאנו אומרים שיר של יום אינו ...
rosends's user avatar
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Are there any halachic sources that discuss the Qumran calendar?

As a Torah reader, I was fascinated when I visited Heichal Hasefer - "Shrine of the Book" and read about the Qumran society and their calendar. As far as I know, there doesn't seem to be much, if ...
DanF's user avatar
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Time as a Spiral

@PixelArtDragon asked what rabbi originated the idea that time is a spiral. @PixelArtDragon said that the earliest they've found is Rav Natan Breslov who lived from 1780-1844 - can anyone locate that ...
barayehudit's user avatar
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What verses in Na"ch describe the details of Jewish calendar like Kidush HaChodesh and Ibbur Hashanah?

The Gemmorah in Jerusalem Rosh Hashana 6a explains the process of adopting the Babylonian names instead of Biblical ones. דא"ר חנינה שמות חדשים עלו בידם מבבל R'Hanina said: the names of the ...
Al Berko's user avatar
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Will the day of the final salvation be celebrated every year in the days of the Moshiach?

Following "what-berachos-should-be-made-when-moshiach-comes", I wondered, for all the great events that G-d did to us we set (in the Torah or Rabbinically) a yearly festive - celebrating the date - ...
Al Berko's user avatar
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Colours for months

According inner.org, each month of the year has a corresponding colour to it. This does not seem to be in Sefer Yetzirah. What is the source for this and what is the significance with regards to each ...
Shaya Naftoli's user avatar
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117 views

What calendar-dependent laws must non-Jews follow?

While the calendar is vastly important in Judaism, it seems like it is barely applicable to non-Jews. The "big seven" Noahide laws seem to be perenially applicable; they dictate general rules for life ...
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