Questions tagged [calendar]

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

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19 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: ...
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Is there a book or online source explaining Jewish year-“type” sequences?

The current Judaic calendar allows for three types of year lengths: Chaser ("missing") - 353 days Kesidra ("in order") - 354 days Shalem ("full") - 355 days (Add 30 to each of the above for leap ...
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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 ...
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87 views

Has Elul Been Made Full Since the Time of Ezra?

In the Gemara in Rosh Hashanah (19b) it 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 Chinnana bar Kahana say ...
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1answer
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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. ...
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Idolatrous origin of the name TAMMUZ

The Gemmorah in [Jerusalem Rosh Hashana 6a][1] explains the process of adopting the Babylonian names on Months instead of Biblical ones. דא"ר חנינה שמות חדשים עלו בידם מבבל R'Hanina said: the ...
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1answer
172 views

How do we know that the Judaic calendar should be primarily lunar based?

There is nowhere in the Torah that specifically mentions that the calendar cycle is to be based mainly on a lunar cycle. (I'm intentionally omitting the notion of the solar / seasonal influence of ...
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1answer
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Why is Pesach sheni one month after Pesach rishon?

Bamidbar 9:11 tells us that Pesach sheni happens a month after Pesach rishon. Pesach sheni was for the unclean or people on a long journey, who couldn't bring Pesach at its appointed time. Did they ...
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379 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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84 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.
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1answer
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What is the starting date of the current Metonic cycle? [closed]

I am setting up an extensive hebrew calendar from hebrew year 3000.
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Why announce Mashiv Haruach and not Vtein Tal?

When we start saying mashiv haruach there is an important requirement of announcing the liturgical change. If one does not hear the announcement, one does not say mashiv until the community would have ...
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1answer
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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 ...
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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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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 ...
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All explicit dates in Tanakh

What are all the dates mentioned in Tanakh? This question seeks all dates that are explicitly mentioned in the verses. No chronological extrapolation or exposition allowed here. The date could be ...
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An improved Jewish calendar after this one expires?

Conventional wisdom has it that about 1600 years ago, the latter Hillel utilized his Sanhedrin to sanctify the Hebrew calendar as we know it today until the year 6000. (Presumably by that point we'll ...
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1answer
368 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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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 ...
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3answers
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Why isn't Shabat haGadol held on the 10th of Nissan?

Why is Shabat haGadol celebrated based on day of the week (Shabat) and not day of the month, if it happened on the 10th of Nissan? Most other days of commemoration in Judaism are celebrated by a day ...
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Declare a leap year due to coronavirus?

Today (23 March 2020) Israel's Supreme Court rejected a petition to declare this year a leap year so Pessah can be postponed for a month, and the seders don't have to occur during a lockdown (...
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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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How is the week referred when there is no parsha read that Shabbat?

Frequently, I have seen on wedding invitations and other correspondences that refer to a date using the parsha name for that week. E.g. an invitation to a wedding may say יום שני בשבת פרשת בא - The ...
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Why is there a different parshat calendar for those in diaspora compared to those in Israel? [duplicate]

According to hebcal.com, there is a parshat calendar for Israel, and a seperate one for Dispora. What is the difference and why are their two?
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Birthdays in Judaism

Is there any significance in Judaism attached to the day someone was born (aside for the 13th year)? Is there anything wrong with celebrating one's birthday? And is it more correct to celebrate the "...
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223 views

Why are some dates off by one day?

The Hebrew calendar works on a 19-year cycle of leap years and a 247-year cycle of varying types of years. This is discussed more fully in Shvili d'Rakia, printed in all Mishnayos containing Tiferes ...
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Why does Adar signal additional joy?

There is an idea that once Adar comes in, we increase in joy. Why is this so? Nisan signals the Exodus and our establishing as a people. Sivan has the giving of the Torah. Kislev has the story of ...
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1answer
128 views

Jewish and English birthdays [duplicate]

Can someone explain to me in simple language why my Jewish and English birthday are not on the same day this year. I will be 76 (4 time 19 ). My English is on Tuesday (today) and my Jewish one on ...
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6answers
998 views

When Adar Begins we increase our Joy-משנכנס אדר מרבים בשמחה

משנכנס אדר מרבים בשמחה- When Adar Begins we increase our Joy (I know it is not in Shulchan Aruch or the Rambam) What is the practical application of it?
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Walled cities for Purim other than Jerusalem

The holiday of Purim is unique in that some locations celebrate it on different days. The rule is: if the city was walled at the time of Joshua's conquest of the Land of Israel then they celebrate on ...
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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
153 views

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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Halachically skipping Purim

There have long been 'legends' of various liberal figures in Judaism, including Yeshayahu Leibovitz (brother of Nechama Leibovitz) that would 'skip' Purim. On the 14th of Adar they would be sure to be ...
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3answers
216 views

Gezer Calendar and Lunar calendar

Do the paleo-Hebrew inscriptions of the Gezer calendar, dated around the 10th century BCE, suggest that at one time the ancient Israelites used a strictly lunar calendar? The calendar is written ...
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2answers
388 views

First-Temple-Era names of the Hebrew months?

The Chumash refers to the months simply as "the first", "the second", and so on. Today we know them by their Babylonian names (Nisan, Iyar ...) Occasionally the Prophets from the First-Temple Era use ...
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Is there any research available for the original 'Hebrew' 3rd & 5th month names?

I'm looking at a question that was posted here 7 years ago about the original name of the months. First-Temple-Era names of the Hebrew months? There is mention of a possible month called, "Tzach."...
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Veset Hachodesh when months are fixed following callendar

Nowadays we follow a calendar for month. Sometimes the Molad is Friday and they are 2 days of Rosh Chodesh Shabbat and Sunday. The dates are far from the astronomic dates. I am curious to know if ...
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3answers
533 views

Historical Daf Yomi calendar

Is there a website that allows you to find what Daf was studied on the a particular date as part of the Daf Yomi cycle?
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5answers
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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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Is there any (relatively) simple way to calculate when/how often the Daf Yomi cycle will finish a tractate on Erev Pesach?

Shulchan Aruch O.C. 470:1 codifies that firstborns fast on Erev Pesach. In my experience, the widespread practice is for firstborns to attend a siyum of the completion of a tractate of Talmud, usually ...
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2answers
140 views

Which event is more infrequent?

This year, we have a couple of infrequent events, and I'm trying to figure out which is less frequent, considering a 19 year cycle (which, I think, is the best time unit to use). Some of the data ...
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1answer
250 views

Questions about the 7000-year shmita cycles

The (currently) top rated answer to this other question says that: R' Aryeh Kaplan z'l teaches as follows: R' Nehunia ben Hakana brings in Sefer Temuna that there are larger shmita cycles of ...
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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 ...
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1answer
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Importance of “Days” in the process of Creation

Why is it important that the Creation process is divided into 6 "days", as opposed to "parts" or "stages" or even presented in simple succession without mentioning "units"?
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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׃ ...
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1answer
143 views

Agricultural events and the Jewish calendar

There are many dates in the Jewish calendar that are connected to agricultural events. They include: Shavuot is Chag Ha'Katzir, the Holiday of the Harvest - Shemot 23:16 Sukkot is Chag Ha'Assif, the ...
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33 views

Holy days on the weekend [duplicate]

There are 13 holy days per year on which we must not work (outside of Israel): 2 Rosh Hashanah, 1 Yom Kippur, 4 Sukkot, 4 Pessah, 2 Shavuot. What are the minimum and maximum numbers of these days that ...
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1answer
98 views

Source for adjusting the calendar for Lo Ad'u Rosh rule

There are 4 rules that would cause the postponement of the 1st day of Rosh Hashanna from being on the day of the molad. One of the most commonly implemented rules is called Lo Ad'u Rosh, meaning that ...
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28 views

How does the Hebrew calendar work in areas with midnight sun? [duplicate]

There are two polar circles, the Arctic Circle and the Antarctic Circle. There are days North of the Arctic Circle, and south of the Antarctic Circle where the sun never sets (summer), or never rises (...
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4answers
681 views

Is it heresy to follow secular dating on the destruction of the first Temple?

There is a discrepancy between rabbinic and secular sources regarding when the first Temple was destroyed -- a difference of some 165 years or so, which are called the "Missing Years." My question is ...

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